56446670645 has 4 divisors (see below), whose sum is σ = 67736004780. Its totient is φ = 45157336512.

The previous prime is 56446670617. The next prime is 56446670663. The reversal of 56446670645 is 54607664465.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8855939236 + 47590731409 = 94106^2 + 218153^2 .

It is a cyclic number.

It is not a de Polignac number, because 56446670645 - 2¹⁶ = 56446605109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5644667060 + ... + 5644667069.

It is an arithmetic number, because the mean of its divisors is an integer number (16934001195).

Almost surely, 2^56446670645 is an apocalyptic number.

It is an amenable number.

56446670645 is a deficient number, since it is larger than the sum of its proper divisors (11289334135).

56446670645 is a wasteful number, since it uses less digits than its factorization.

56446670645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11289334134.

The product of its (nonzero) digits is 14515200, while the sum is 53.

The spelling of 56446670645 in words is "fifty-six billion, four hundred forty-six million, six hundred seventy thousand, six hundred forty-five".