6400056961 has 4 divisors (see below), whose sum is σ = 6428756992. Its totient is φ = 6371356932.

The previous prime is 6400056953. The next prime is 6400056967. The reversal of 6400056961 is 1696500046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1696500046 = 2 ⋅848250023.

It is a cyclic number.

It is not a de Polignac number, because 6400056961 - 2³ = 6400056953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6400056961.

It is not an unprimeable number, because it can be changed into a prime (6400056967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14349681 + ... + 14350126.

It is an arithmetic number, because the mean of its divisors is an integer number (1607189248).

Almost surely, 2^6400056961 is an apocalyptic number.

It is an amenable number.

6400056961 is a deficient number, since it is larger than the sum of its proper divisors (28700031).

6400056961 is a wasteful number, since it uses less digits than its factorization.

6400056961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28700030.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 6400056961 is about 80000.3560054579. The cubic root of 6400056961 is about 1856.6410415442.

The spelling of 6400056961 in words is "six billion, four hundred million, fifty-six thousand, nine hundred sixty-one".