66474437844 has 24 divisors (see below), whose sum is σ = 156849799680. Its totient is φ = 21909177664.

The previous prime is 66474437839. The next prime is 66474437849. The reversal of 66474437844 is 44873447466.

It is an interprime number because it is at equal distance from previous prime (66474437839) and next prime (66474437849).

It is a hoax number, since the sum of its digits (57) 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 (66474437849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31119924 + ... + 31122059.

It is an arithmetic number, because the mean of its divisors is an integer number (6535408320).

Almost surely, 2^66474437844 is an apocalyptic number.

It is an amenable number.

66474437844 is an abundant number, since it is smaller than the sum of its proper divisors (90375361836).

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

66474437844 is a wasteful number, since it uses less digits than its factorization.

66474437844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62242079 (or 62242077 counting only the distinct ones).

The product of its digits is 43352064, while the sum is 57.

The spelling of 66474437844 in words is "sixty-six billion, four hundred seventy-four million, four hundred thirty-seven thousand, eight hundred forty-four".