57651307561 has 4 divisors (see below), whose sum is σ = 58345901712. Its totient is φ = 56956713412.

The previous prime is 57651307543. The next prime is 57651307577. The reversal of 57651307561 is 16570315675.

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.

It is a cyclic number.

It is not a de Polignac number, because 57651307561 - 2⁵ = 57651307529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57651307591) 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, 347296951 + ... + 347297116.

It is an arithmetic number, because the mean of its divisors is an integer number (14586475428).

Almost surely, 2^57651307561 is an apocalyptic number.

It is an amenable number.

57651307561 is a deficient number, since it is larger than the sum of its proper divisors (694594151).

57651307561 is an equidigital number, since it uses as much as digits as its factorization.

57651307561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694594150.

The product of its (nonzero) digits is 661500, while the sum is 46.

The spelling of 57651307561 in words is "fifty-seven billion, six hundred fifty-one million, three hundred seven thousand, five hundred sixty-one".