1956781893057 has 8 divisors (see below), whose sum is σ = 2609052833184. Its totient is φ = 1304516107488.

The previous prime is 1956781893041. The next prime is 1956781893061. The reversal of 1956781893057 is 7503981876591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1956781893057 - 2⁴ = 1956781893041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1956781892982 and 1956781893000.

It is not an unprimeable number, because it can be changed into a prime (1956781893257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292948 + ... + 1999845.

It is an arithmetic number, because the mean of its divisors is an integer number (326131604148).

Almost surely, 2^{1956781893057} is an apocalyptic number.

It is an amenable number.

1956781893057 is a deficient number, since it is larger than the sum of its proper divisors (652270940127).

1956781893057 is a wasteful number, since it uses less digits than its factorization.

1956781893057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577279.

The product of its (nonzero) digits is 114307200, while the sum is 69.

The spelling of 1956781893057 in words is "one trillion, nine hundred fifty-six billion, seven hundred eighty-one million, eight hundred ninety-three thousand, fifty-seven".