72407667651565 has 4 divisors (see below), whose sum is σ = 86889201181884. Its totient is φ = 57926134121248.

The previous prime is 72407667651559. The next prime is 72407667651601. The reversal of 72407667651565 is 56515676670427.

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

It can be written as a sum of positive squares in 2 ways, for example, as 51033264075049 + 21374403576516 = 7143757^2 + 4623246^2 .

It is a cyclic number.

It is not a de Polignac number, because 72407667651565 - 2⁷ = 72407667651437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72407667651565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7240766765152 + ... + 7240766765161.

It is an arithmetic number, because the mean of its divisors is an integer number (21722300295471).

Almost surely, 2^{72407667651565} is an apocalyptic number.

It is an amenable number.

72407667651565 is a deficient number, since it is larger than the sum of its proper divisors (14481533530319).

72407667651565 is a wasteful number, since it uses less digits than its factorization.

72407667651565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14481533530318.

The product of its (nonzero) digits is 444528000, while the sum is 67.

The spelling of 72407667651565 in words is "seventy-two trillion, four hundred seven billion, six hundred sixty-seven million, six hundred fifty-one thousand, five hundred sixty-five".