1278158770560 has 512 divisors, whose sum is σ = 5020793164800. Its totient is φ = 270021427200.

The previous prime is 1278158770547. The next prime is 1278158770613. The reversal of 1278158770560 is 650778518721.

It is a happy number.

It is a super-3 number, since 3×1278158770560³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 1278158770560.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10408720 + ... + 10530800.

It is an arithmetic number, because the mean of its divisors is an integer number (9806236650).

Almost surely, 2^{1278158770560} is an apocalyptic number.

1278158770560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278158770560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2510396582400).

1278158770560 is an abundant number, since it is smaller than the sum of its proper divisors (3742634394240).

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

1278158770560 is a wasteful number, since it uses less digits than its factorization.

1278158770560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122170 (or 122158 counting only the distinct ones).

The product of its (nonzero) digits is 6585600, while the sum is 57.

The spelling of 1278158770560 in words is "one trillion, two hundred seventy-eight billion, one hundred fifty-eight million, seven hundred seventy thousand, five hundred sixty".