38666257947 has 6 divisors (see below), whose sum is σ = 55851261492. Its totient is φ = 25777505292.

The previous prime is 38666257891. The next prime is 38666257957. The reversal of 38666257947 is 74975266683.

It is not a de Polignac number, because 38666257947 - 2¹² = 38666253851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38666257957) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2148125433 + ... + 2148125450.

It is an arithmetic number, because the mean of its divisors is an integer number (9308543582).

Almost surely, 2^38666257947 is an apocalyptic number.

38666257947 is a deficient number, since it is larger than the sum of its proper divisors (17185003545).

38666257947 is a wasteful number, since it uses less digits than its factorization.

38666257947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4296250889 (or 4296250886 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 63.

The spelling of 38666257947 in words is "thirty-eight billion, six hundred sixty-six million, two hundred fifty-seven thousand, nine hundred forty-seven".