66662180838 has 24 divisors (see below), whose sum is σ = 157565155176. Its totient is φ = 20200660800.

The previous prime is 66662180833. The next prime is 66662180843. The reversal of 66662180838 is 83808126666.

66662180838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66662180833) and next prime (66662180843).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66662180833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168338643 + ... + 168339038.

It is an arithmetic number, because the mean of its divisors is an integer number (6565214799).

Almost surely, 2^66662180838 is an apocalyptic number.

66662180838 is an abundant number, since it is smaller than the sum of its proper divisors (90902974338).

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

66662180838 is a wasteful number, since it uses less digits than its factorization.

66662180838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336677700 (or 336677697 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 66662180838 in words is "sixty-six billion, six hundred sixty-two million, one hundred eighty thousand, eight hundred thirty-eight".