1256363537920 has 80 divisors (see below), whose sum is σ = 3085799558688. Its totient is φ = 490288168960.

The previous prime is 1256363537843. The next prime is 1256363537969. The reversal of 1256363537920 is 297353636521.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5880004 + ... + 6089923.

Almost surely, 2^{1256363537920} is an apocalyptic number.

1256363537920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256363537920 is an abundant number, since it is smaller than the sum of its proper divisors (1829436020768).

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

1256363537920 is an equidigital number, since it uses as much as digits as its factorization.

1256363537920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11969991 (or 11969975 counting only the distinct ones).

The product of its (nonzero) digits is 6123600, while the sum is 52.

The spelling of 1256363537920 in words is "one trillion, two hundred fifty-six billion, three hundred sixty-three million, five hundred thirty-seven thousand, nine hundred twenty".