53865303921 has 81 divisors (see below), whose sum is σ = 92777809761. Its totient is φ = 30078734400.

The previous prime is 53865303911. The next prime is 53865303923. The reversal of 53865303921 is 12930356835.

It is a happy number.

The square root of 53865303921 is 232089.

It is a perfect power (a square), and thus also a powerful number.

53865303921 is a `hidden beast` number, since 5 + 3 + 86 + 530 + 39 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12112103025 + 41753200896 = 110055^2 + 204336^2 .

It is not a de Polignac number, because 53865303921 - 2²⁹ = 53328433009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53865303923) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 99565911 + ... + 99566451.

Almost surely, 2^53865303921 is an apocalyptic number.

53865303921 is the 232089-th square number.

53865303921 is the 116045-th centered octagonal number.

It is an amenable number.

53865303921 is a deficient number, since it is larger than the sum of its proper divisors (38912505840).

53865303921 is a wasteful number, since it uses less digits than its factorization.

53865303921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 53865303921 in words is "fifty-three billion, eight hundred sixty-five million, three hundred three thousand, nine hundred twenty-one".