72018577501 has 6 divisors (see below), whose sum is σ = 77984613690. Its totient is φ = 66478686768.

The previous prime is 72018577481. The next prime is 72018577513. The reversal of 72018577501 is 10577581027.

It can be written as a sum of positive squares in 3 ways, for example, as 7630022500 + 64388555001 = 87350^2 + 253749^2 .

It is not a de Polignac number, because 72018577501 - 2⁵ = 72018577469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72018577801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213072546 + ... + 213072883.

It is an arithmetic number, because the mean of its divisors is an integer number (12997435615).

Almost surely, 2^72018577501 is an apocalyptic number.

It is an amenable number.

72018577501 is a deficient number, since it is larger than the sum of its proper divisors (5966036189).

72018577501 is a wasteful number, since it uses less digits than its factorization.

72018577501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426145455 (or 426145442 counting only the distinct ones).

The product of its (nonzero) digits is 137200, while the sum is 43.

The spelling of 72018577501 in words is "seventy-two billion, eighteen million, five hundred seventy-seven thousand, five hundred one".