38685384278521 has 16 divisors (see below), whose sum is σ = 41336120672640. Its totient is φ = 36077543251200.

The previous prime is 38685384278491. The next prime is 38685384278549. The reversal of 38685384278521 is 12587248358683.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38685384278521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38685384278551) 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, 17961091 + ... + 19999288.

It is an arithmetic number, because the mean of its divisors is an integer number (2583507542040).

Almost surely, 2^{38685384278521} is an apocalyptic number.

It is an amenable number.

38685384278521 is a deficient number, since it is larger than the sum of its proper divisors (2650736394119).

38685384278521 is a wasteful number, since it uses less digits than its factorization.

38685384278521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37960944.

The product of its digits is 619315200, while the sum is 70.

The spelling of 38685384278521 in words is "thirty-eight trillion, six hundred eighty-five billion, three hundred eighty-four million, two hundred seventy-eight thousand, five hundred twenty-one".