72100020011660 has 96 divisors (see below), whose sum is σ = 153224618426880. Its totient is φ = 28496627324928.

The previous prime is 72100020011647. The next prime is 72100020011729. The reversal of 72100020011660 is 6611002000127.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 574315817 + ... + 574441343.

It is an arithmetic number, because the mean of its divisors is an integer number (1596089775280).

Almost surely, 2^{72100020011660} is an apocalyptic number.

It is an amenable number.

72100020011660 is an abundant number, since it is smaller than the sum of its proper divisors (81124598415220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72100020011660 is a wasteful number, since it uses less digits than its factorization.

72100020011660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126655 (or 126653 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

Adding to 72100020011660 its reverse (6611002000127), we get a palindrome (78711022011787).

The spelling of 72100020011660 in words is "seventy-two trillion, one hundred billion, twenty million, eleven thousand, six hundred sixty".