1263252730820 has 24 divisors (see below), whose sum is σ = 2664216284184. Its totient is φ = 503132416256.

The previous prime is 1263252730811. The next prime is 1263252730823. The reversal of 1263252730820 is 280372523621.

It can be written as a sum of positive squares in 4 ways, for example, as 22470609604 + 1240782121216 = 149902^2 + 1113904^2 .

It is not an unprimeable number, because it can be changed into a prime (1263252730823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135537479 + ... + 135546798.

It is an arithmetic number, because the mean of its divisors is an integer number (111009011841).

Almost surely, 2^{1263252730820} is an apocalyptic number.

1263252730820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263252730820 is an abundant number, since it is smaller than the sum of its proper divisors (1400963553364).

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

1263252730820 is a wasteful number, since it uses less digits than its factorization.

1263252730820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271084519 (or 271084517 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 1263252730820 in words is "one trillion, two hundred sixty-three billion, two hundred fifty-two million, seven hundred thirty thousand, eight hundred twenty".