53660331921 has 24 divisors (see below), whose sum is σ = 86860959040. Its totient is φ = 28859334912.

The previous prime is 53660331877. The next prime is 53660331961. The reversal of 53660331921 is 12913306635.

It is not a de Polignac number, because 53660331921 - 2¹⁵ = 53660299153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53660331921.

It is not an unprimeable number, because it can be changed into a prime (53660331961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4414786 + ... + 4426923.

Almost surely, 2^53660331921 is an apocalyptic number.

53660331921 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

53660331921 is a deficient number, since it is larger than the sum of its proper divisors (33200627119).

53660331921 is a wasteful number, since it uses less digits than its factorization.

53660331921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8841753 (or 8841736 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 39.

The spelling of 53660331921 in words is "fifty-three billion, six hundred sixty million, three hundred thirty-one thousand, nine hundred twenty-one".