66557336 has 16 divisors (see below), whose sum is σ = 125072640. Its totient is φ = 33204640.

The previous prime is 66557333. The next prime is 66557353. The reversal of 66557336 is 63375566.

It is a junction number, because it is equal to n+sod(n) for n = 66557293 and 66557302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66557333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5336 + ... + 12711.

It is an arithmetic number, because the mean of its divisors is an integer number (7817040).

Almost surely, 2^66557336 is an apocalyptic number.

It is an amenable number.

66557336 is a deficient number, since it is larger than the sum of its proper divisors (58515304).

66557336 is a wasteful number, since it uses less digits than its factorization.

66557336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18514 (or 18510 counting only the distinct ones).

The product of its digits is 340200, while the sum is 41.

The square root of 66557336 is about 8158.2679534323. The cubic root of 66557336 is about 405.2583546918.

The spelling of 66557336 in words is "sixty-six million, five hundred fifty-seven thousand, three hundred thirty-six".