71572655412 has 18 divisors (see below), whose sum is σ = 180919767938. Its totient is φ = 23857551792.

The previous prime is 71572655389. The next prime is 71572655449. The reversal of 71572655412 is 21455627517.

71572655412 is a `hidden beast` number, since 7 + 1 + 572 + 65 + 5 + 4 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46175133456 + 25397521956 = 214884^2 + 159366^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 994064623 + ... + 994064694.

Almost surely, 2^71572655412 is an apocalyptic number.

It is an amenable number.

71572655412 is an abundant number, since it is smaller than the sum of its proper divisors (109347112526).

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

71572655412 is a wasteful number, since it uses less digits than its factorization.

71572655412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988129327 (or 1988129322 counting only the distinct ones).

The product of its digits is 588000, while the sum is 45.

The spelling of 71572655412 in words is "seventy-one billion, five hundred seventy-two million, six hundred fifty-five thousand, four hundred twelve".