57143612661 has 4 divisors (see below), whose sum is σ = 76191483552. Its totient is φ = 38095741772.

The previous prime is 57143612657. The next prime is 57143612681. The reversal of 57143612661 is 16621634175.

57143612661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 57143612661 - 2² = 57143612657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57143612681) 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, 9523935441 + ... + 9523935446.

It is an arithmetic number, because the mean of its divisors is an integer number (19047870888).

Almost surely, 2^57143612661 is an apocalyptic number.

It is an amenable number.

57143612661 is a deficient number, since it is larger than the sum of its proper divisors (19047870891).

57143612661 is a wasteful number, since it uses less digits than its factorization.

57143612661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19047870890.

The product of its digits is 181440, while the sum is 42.

The spelling of 57143612661 in words is "fifty-seven billion, one hundred forty-three million, six hundred twelve thousand, six hundred sixty-one".