38721486978721 has 16 divisors (see below), whose sum is σ = 39482994398848. Its totient is φ = 37964124576000.

The previous prime is 38721486978719. The next prime is 38721486978787. The reversal of 38721486978721 is 12787968412783.

It is a cyclic number.

It is not a de Polignac number, because 38721486978721 - 2¹ = 38721486978719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38721486978791) 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, 82054396 + ... + 82524946.

It is an arithmetic number, because the mean of its divisors is an integer number (2467687149928).

Almost surely, 2^{38721486978721} is an apocalyptic number.

It is an amenable number.

38721486978721 is a deficient number, since it is larger than the sum of its proper divisors (761507420127).

38721486978721 is a wasteful number, since it uses less digits than its factorization.

38721486978721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474952.

The product of its digits is 455196672, while the sum is 73.

The spelling of 38721486978721 in words is "thirty-eight trillion, seven hundred twenty-one billion, four hundred eighty-six million, nine hundred seventy-eight thousand, seven hundred twenty-one".