66837816 has 48 divisors (see below), whose sum is σ = 188894160. Its totient is φ = 21310080.

The previous prime is 66837809. The next prime is 66837821. The reversal of 66837816 is 61873866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18525 + ... + 21836.

It is an arithmetic number, because the mean of its divisors is an integer number (3935295).

Almost surely, 2^66837816 is an apocalyptic number.

It is an amenable number.

66837816 is an abundant number, since it is smaller than the sum of its proper divisors (122056344).

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

66837816 is a wasteful number, since it uses less digits than its factorization.

66837816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40396 (or 40389 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 66837816 is about 8175.4398046833. The cubic root of 66837816 is about 405.8268247992.

The spelling of 66837816 in words is "sixty-six million, eight hundred thirty-seven thousand, eight hundred sixteen".