38666546478 has 128 divisors (see below), whose sum is σ = 105530342400. Its totient is φ = 10242422784.

The previous prime is 38666546449. The next prime is 38666546483. The reversal of 38666546478 is 87464566683.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 385638 + ... + 475446.

It is an arithmetic number, because the mean of its divisors is an integer number (824455800).

Almost surely, 2^38666546478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38666546478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52765171200).

38666546478 is an abundant number, since it is smaller than the sum of its proper divisors (66863795922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38666546478 is a wasteful number, since it uses less digits than its factorization.

38666546478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89911 (or 89905 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 63.

The spelling of 38666546478 in words is "thirty-eight billion, six hundred sixty-six million, five hundred forty-six thousand, four hundred seventy-eight".