73764215345521 has 16 divisors (see below), whose sum is σ = 78156333720576. Its totient is φ = 69378006491136.

The previous prime is 73764215345519. The next prime is 73764215345567. The reversal of 73764215345521 is 12554351246737.

It is a cyclic number.

It is not a de Polignac number, because 73764215345521 - 2¹ = 73764215345519 is a prime.

It is a super-2 number, since 2×73764215345521² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (73764215345581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154801585 + ... + 155277361.

It is an arithmetic number, because the mean of its divisors is an integer number (4884770857536).

Almost surely, 2^{73764215345521} is an apocalyptic number.

It is an amenable number.

73764215345521 is a deficient number, since it is larger than the sum of its proper divisors (4392118375055).

73764215345521 is a wasteful number, since it uses less digits than its factorization.

73764215345521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481968.

The product of its digits is 21168000, while the sum is 55.

The spelling of 73764215345521 in words is "seventy-three trillion, seven hundred sixty-four billion, two hundred fifteen million, three hundred forty-five thousand, five hundred twenty-one".