72504756649691 has 4 divisors (see below), whose sum is σ = 72509671241592. Its totient is φ = 72499842057792.

The previous prime is 72504756649679. The next prime is 72504756649739. The reversal of 72504756649691 is 19694665740527.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72504756649691 - 2⁶ = 72504756649627 is a prime.

It is a super-2 number, since 2×72504756649691² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72504756649651) 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, 2457273821 + ... + 2457303326.

It is an arithmetic number, because the mean of its divisors is an integer number (18127417810398).

Almost surely, 2^{72504756649691} is an apocalyptic number.

72504756649691 is a deficient number, since it is larger than the sum of its proper divisors (4914591901).

72504756649691 is a wasteful number, since it uses less digits than its factorization.

72504756649691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4914591900.

The product of its (nonzero) digits is 685843200, while the sum is 71.

The spelling of 72504756649691 in words is "seventy-two trillion, five hundred four billion, seven hundred fifty-six million, six hundred forty-nine thousand, six hundred ninety-one".