57020621765 has 4 divisors (see below), whose sum is σ = 68424746124. Its totient is φ = 45616497408.

The previous prime is 57020621761. The next prime is 57020621767. The reversal of 57020621765 is 56712602075.

57020621765 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.

It can be written as a sum of positive squares in 2 ways, for example, as 38166311044 + 18854310721 = 195362^2 + 137311^2 .

It is a cyclic number.

It is not a de Polignac number, because 57020621765 - 2² = 57020621761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57020621761) 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, 5702062172 + ... + 5702062181.

It is an arithmetic number, because the mean of its divisors is an integer number (17106186531).

Almost surely, 2^57020621765 is an apocalyptic number.

It is an amenable number.

57020621765 is a deficient number, since it is larger than the sum of its proper divisors (11404124359).

57020621765 is a wasteful number, since it uses less digits than its factorization.

57020621765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11404124358.

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 57020621765 in words is "fifty-seven billion, twenty million, six hundred twenty-one thousand, seven hundred sixty-five".