53662172131721 has 32 divisors (see below), whose sum is σ = 55818656340480. Its totient is φ = 51544751791104.

The previous prime is 53662172131717. The next prime is 53662172131723. The reversal of 53662172131721 is 12713127126635.

It is a cyclic number.

It is not a de Polignac number, because 53662172131721 - 2² = 53662172131717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53662172131723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6948354566 + ... + 6948362288.

It is an arithmetic number, because the mean of its divisors is an integer number (1744333010640).

Almost surely, 2^{53662172131721} is an apocalyptic number.

It is an amenable number.

53662172131721 is a deficient number, since it is larger than the sum of its proper divisors (2156484208759).

53662172131721 is a wasteful number, since it uses less digits than its factorization.

53662172131721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10865.

The product of its digits is 635040, while the sum is 47.

The spelling of 53662172131721 in words is "fifty-three trillion, six hundred sixty-two billion, one hundred seventy-two million, one hundred thirty-one thousand, seven hundred twenty-one".