66137916 has 24 divisors (see below), whose sum is σ = 166193104. Its totient is φ = 20350080.

The previous prime is 66137909. The next prime is 66137923. The reversal of 66137916 is 61973166.

It is an interprime number because it is at equal distance from previous prime (66137909) and next prime (66137923).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

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, 211825 + ... + 212136.

Almost surely, 2^66137916 is an apocalyptic number.

It is an amenable number.

66137916 is an abundant number, since it is smaller than the sum of its proper divisors (100055188).

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

66137916 is a wasteful number, since it uses less digits than its factorization.

66137916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423981 (or 423979 counting only the distinct ones).

The product of its digits is 40824, while the sum is 39.

The square root of 66137916 is about 8132.5221180148. The cubic root of 66137916 is about 404.4052969551.

The spelling of 66137916 in words is "sixty-six million, one hundred thirty-seven thousand, nine hundred sixteen".