1278369422500 has 45 divisors (see below), whose sum is σ = 2795661883861. Its totient is φ = 511325156000.

The previous prime is 1278369422483. The next prime is 1278369422501. The reversal of 1278369422500 is 52249638721.

It is a happy number.

The square root of 1278369422500 is 1130650.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 1049342091876 + 229027330624 = 1024374^2 + 478568^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278369422501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 56521194 + ... + 56543806.

It is a 1-persistent number, because it is pandigital, but 2⋅1278369422500 = 2556738845000 is not.

Almost surely, 2^{1278369422500} is an apocalyptic number.

1278369422500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1278369422500 is the 1130650-th square number.

It is an amenable number.

1278369422500 is an abundant number, since it is smaller than the sum of its proper divisors (1517292461361).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278369422500 is an frugal number, since it uses more digits than its factorization.

1278369422500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45250 (or 22620 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

Multiplying 1278369422500 by its sum of digits (49), we get a square (62640101702500 = 7914550²).

The spelling of 1278369422500 in words is "one trillion, two hundred seventy-eight billion, three hundred sixty-nine million, four hundred twenty-two thousand, five hundred".