72646714537 has 4 divisors (see below), whose sum is σ = 72929386836. Its totient is φ = 72364042240.

The previous prime is 72646714523. The next prime is 72646714577. The reversal of 72646714537 is 73541764627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73541764627 = 79 ⋅930908413.

It can be written as a sum of positive squares in 2 ways, for example, as 46657728016 + 25988986521 = 216004^2 + 161211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72646714537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72646714577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141335764 + ... + 141336277.

It is an arithmetic number, because the mean of its divisors is an integer number (18232346709).

Almost surely, 2^72646714537 is an apocalyptic number.

It is an amenable number.

72646714537 is a deficient number, since it is larger than the sum of its proper divisors (282672299).

72646714537 is a wasteful number, since it uses less digits than its factorization.

72646714537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282672298.

The product of its digits is 5927040, while the sum is 52.

The spelling of 72646714537 in words is "seventy-two billion, six hundred forty-six million, seven hundred fourteen thousand, five hundred thirty-seven".