66557662 has 4 divisors (see below), whose sum is σ = 99836496. Its totient is φ = 33278830.

The previous prime is 66557657. The next prime is 66557663. The reversal of 66557662 is 26675566.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66557663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16639414 + ... + 16639417.

It is an arithmetic number, because the mean of its divisors is an integer number (24959124).

Almost surely, 2^66557662 is an apocalyptic number.

66557662 is a deficient number, since it is larger than the sum of its proper divisors (33278834).

66557662 is a wasteful number, since it uses less digits than its factorization.

66557662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33278833.

The product of its digits is 453600, while the sum is 43.

The square root of 66557662 is about 8158.2879331389. The cubic root of 66557662 is about 405.2590163469.

The spelling of 66557662 in words is "sixty-six million, five hundred fifty-seven thousand, six hundred sixty-two".