66837670416 has 60 divisors (see below), whose sum is σ = 204057438000. Its totient is φ = 20253839040.

The previous prime is 66837670411. The next prime is 66837670421. The reversal of 66837670416 is 61407673866.

It is an interprime number because it is at equal distance from previous prime (66837670411) and next prime (66837670421).

It is a super-2 number, since 2×66837670416² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66837670411) 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, 21096166 + ... + 21099333.

It is an arithmetic number, because the mean of its divisors is an integer number (3400957300).

Almost surely, 2^66837670416 is an apocalyptic number.

66837670416 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

66837670416 is an abundant number, since it is smaller than the sum of its proper divisors (137219767584).

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

66837670416 is a wasteful number, since it uses less digits than its factorization.

66837670416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42195524 (or 42195515 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 54.

The spelling of 66837670416 in words is "sixty-six billion, eight hundred thirty-seven million, six hundred seventy thousand, four hundred sixteen".