72531563661716 has 24 divisors (see below), whose sum is σ = 127488011042280. Its totient is φ = 36106632576000.

The previous prime is 72531563661659. The next prime is 72531563661743. The reversal of 72531563661716 is 61716636513527.

It can be written as a sum of positive squares in 4 ways, for example, as 125419389316 + 72406144272400 = 354146^2 + 8509180^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25515131 + ... + 28214978.

It is an arithmetic number, because the mean of its divisors is an integer number (5312000460095).

Almost surely, 2^{72531563661716} is an apocalyptic number.

It is an amenable number.

72531563661716 is a deficient number, since it is larger than the sum of its proper divisors (54956447380564).

72531563661716 is a wasteful number, since it uses less digits than its factorization.

72531563661716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53731595 (or 53731593 counting only the distinct ones).

The product of its digits is 28576800, while the sum is 59.

The spelling of 72531563661716 in words is "seventy-two trillion, five hundred thirty-one billion, five hundred sixty-three million, six hundred sixty-one thousand, seven hundred sixteen".