38661555387 has 64 divisors (see below), whose sum is σ = 64059899904. Its totient is φ = 20195809920.

The previous prime is 38661555371. The next prime is 38661555389. The reversal of 38661555387 is 78355516683.

It is not a de Polignac number, because 38661555387 - 2⁴ = 38661555371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38661555389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25998958 + ... + 26000444.

It is an arithmetic number, because the mean of its divisors is an integer number (1000935936).

Almost surely, 2^38661555387 is an apocalyptic number.

38661555387 is a deficient number, since it is larger than the sum of its proper divisors (25398344517).

38661555387 is a wasteful number, since it uses less digits than its factorization.

38661555387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368.

The product of its digits is 18144000, while the sum is 57.

The spelling of 38661555387 in words is "thirty-eight billion, six hundred sixty-one million, five hundred fifty-five thousand, three hundred eighty-seven".