72808154621 has 4 divisors (see below), whose sum is σ = 74042191200. Its totient is φ = 71574118044.

The previous prime is 72808154611. The next prime is 72808154633. The reversal of 72808154621 is 12645180827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12645180827 = 19 ⋅665535833.

It is a cyclic number.

It is not a de Polignac number, because 72808154621 - 2¹⁸ = 72807892477 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 (72808154611) 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, 617018201 + ... + 617018318.

It is an arithmetic number, because the mean of its divisors is an integer number (18510547800).

Almost surely, 2^72808154621 is an apocalyptic number.

It is an amenable number.

72808154621 is a deficient number, since it is larger than the sum of its proper divisors (1234036579).

72808154621 is a wasteful number, since it uses less digits than its factorization.

72808154621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234036578.

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 72808154621 in words is "seventy-two billion, eight hundred eight million, one hundred fifty-four thousand, six hundred twenty-one".