1256734261830 has 32 divisors (see below), whose sum is σ = 3017167496928. Its totient is φ = 335017440000.

The previous prime is 1256734261799. The next prime is 1256734261841. The reversal of 1256734261830 is 381624376521.

It is a super-4 number, since 4×1256734261830⁴ (a number of 49 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1256734261830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6889501 + ... + 7069560.

It is an arithmetic number, because the mean of its divisors is an integer number (94286484279).

Almost surely, 2^{1256734261830} is an apocalyptic number.

1256734261830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1256734261830 is an abundant number, since it is smaller than the sum of its proper divisors (1760433235098).

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

1256734261830 is a wasteful number, since it uses less digits than its factorization.

1256734261830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13962072.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 1256734261830 in words is "one trillion, two hundred fifty-six billion, seven hundred thirty-four million, two hundred sixty-one thousand, eight hundred thirty".