38401865818 has 16 divisors (see below), whose sum is σ = 58702608360. Its totient is φ = 18834489856.

The previous prime is 38401865791. The next prime is 38401865839. The reversal of 38401865818 is 81856810483.

It can be written as a sum of positive squares in 4 ways, for example, as 35998611289 + 2403254529 = 189733^2 + 49023^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472998 + ... + 548206.

Almost surely, 2^38401865818 is an apocalyptic number.

38401865818 is a deficient number, since it is larger than the sum of its proper divisors (20300742542).

38401865818 is a wasteful number, since it uses less digits than its factorization.

38401865818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80081.

The product of its (nonzero) digits is 1474560, while the sum is 52.

The spelling of 38401865818 in words is "thirty-eight billion, four hundred one million, eight hundred sixty-five thousand, eight hundred eighteen".