57690721921 has 8 divisors (see below), whose sum is σ = 65952145280. Its totient is φ = 49434271488.

The previous prime is 57690721919. The next prime is 57690721969. The reversal of 57690721921 is 12912709675.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 57690721921 - 2¹ = 57690721919 is a prime.

It is a super-2 number, since 2×57690721921² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (57690721021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1218336 + ... + 1264801.

It is an arithmetic number, because the mean of its divisors is an integer number (8244018160).

Almost surely, 2^57690721921 is an apocalyptic number.

It is an amenable number.

57690721921 is a deficient number, since it is larger than the sum of its proper divisors (8261423359).

57690721921 is a wasteful number, since it uses less digits than its factorization.

57690721921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486463.

The product of its (nonzero) digits is 476280, while the sum is 49.

The spelling of 57690721921 in words is "fifty-seven billion, six hundred ninety million, seven hundred twenty-one thousand, nine hundred twenty-one".