57217721845 has 8 divisors (see below), whose sum is σ = 68662728864. Its totient is φ = 45773202384.

The previous prime is 57217721809. The next prime is 57217721881. The reversal of 57217721845 is 54812771275.

It is an interprime number because it is at equal distance from previous prime (57217721809) and next prime (57217721881).

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

It is a cyclic number.

It is not a de Polignac number, because 57217721845 - 2²⁷ = 57083504117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227182 + ... + 407488.

It is an arithmetic number, because the mean of its divisors is an integer number (8582841108).

Almost surely, 2^57217721845 is an apocalyptic number.

It is an amenable number.

57217721845 is a deficient number, since it is larger than the sum of its proper divisors (11445007019).

57217721845 is a wasteful number, since it uses less digits than its factorization.

57217721845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243779.

The product of its digits is 1097600, while the sum is 49.

The spelling of 57217721845 in words is "fifty-seven billion, two hundred seventeen million, seven hundred twenty-one thousand, eight hundred forty-five".