71440736656 has 15 divisors (see below), whose sum is σ = 138418498753. Its totient is φ = 35719833760.

The previous prime is 71440736651. The next prime is 71440736659. The reversal of 71440736656 is 65663704417.

The square root of 71440736656 is 267284.

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

It can be written as a sum of positive squares in only one way, i.e., 9817639056 + 61623097600 = 99084^2 + 248240^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71440736651) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1035726 + ... + 1102546.

Almost surely, 2^71440736656 is an apocalyptic number.

71440736656 is the 267284-th square number.

It is an amenable number.

71440736656 is a deficient number, since it is larger than the sum of its proper divisors (66977762097).

71440736656 is an frugal number, since it uses more digits than its factorization.

71440736656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133650 (or 66823 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 49.

Multiplying 71440736656 by its sum of digits (49), we get a square (3500596096144 = 1870988²).

The spelling of 71440736656 in words is "seventy-one billion, four hundred forty million, seven hundred thirty-six thousand, six hundred fifty-six".