1256322132978 has 16 divisors (see below), whose sum is σ = 2741066472096. Its totient is φ = 380703676640.

The previous prime is 1256322132977. The next prime is 1256322132979. The reversal of 1256322132978 is 8792312236521.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1256322132977) and next prime (1256322132979).

It is a Smith number, since the sum of its digits (51) 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 1256322132978.

It is not an unprimeable number, because it can be changed into a prime (1256322132977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9517591851 + ... + 9517591982.

It is an arithmetic number, because the mean of its divisors is an integer number (171316654506).

Almost surely, 2^{1256322132978} is an apocalyptic number.

1256322132978 is an abundant number, since it is smaller than the sum of its proper divisors (1484744339118).

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

1256322132978 is a wasteful number, since it uses less digits than its factorization.

1256322132978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19035183849.

The product of its digits is 2177280, while the sum is 51.

The spelling of 1256322132978 in words is "one trillion, two hundred fifty-six billion, three hundred twenty-two million, one hundred thirty-two thousand, nine hundred seventy-eight".