72441661564 has 6 divisors (see below), whose sum is σ = 126772907744. Its totient is φ = 36220830780.

The previous prime is 72441661561. The next prime is 72441661613. The reversal of 72441661564 is 46516614427.

It is a happy number.

It is a super-2 number, since 2×72441661564² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72441661561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9055207692 + ... + 9055207699.

Almost surely, 2^72441661564 is an apocalyptic number.

It is an amenable number.

72441661564 is a deficient number, since it is larger than the sum of its proper divisors (54331246180).

72441661564 is a wasteful number, since it uses less digits than its factorization.

72441661564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18110415395 (or 18110415393 counting only the distinct ones).

The product of its digits is 967680, while the sum is 46.

The spelling of 72441661564 in words is "seventy-two billion, four hundred forty-one million, six hundred sixty-one thousand, five hundred sixty-four".