57647678981 has 4 divisors (see below), whose sum is σ = 57648802092. Its totient is φ = 57646555872.

The previous prime is 57647678927. The next prime is 57647678983. The reversal of 57647678981 is 18987674675.

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 8689036225 + 48958642756 = 93215^2 + 221266^2 .

It is a cyclic number.

It is not a de Polignac number, because 57647678981 - 2³⁰ = 56573937157 is a prime.

It is a super-2 number, since 2×57647678981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57647678983) 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, 480680 + ... + 588513.

It is an arithmetic number, because the mean of its divisors is an integer number (14412200523).

Almost surely, 2^57647678981 is an apocalyptic number.

It is an amenable number.

57647678981 is a deficient number, since it is larger than the sum of its proper divisors (1123111).

57647678981 is a wasteful number, since it uses less digits than its factorization.

57647678981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123110.

The product of its digits is 142248960, while the sum is 68.

The spelling of 57647678981 in words is "fifty-seven billion, six hundred forty-seven million, six hundred seventy-eight thousand, nine hundred eighty-one".