66644998 has 48 divisors (see below), whose sum is σ = 124597440. Its totient is φ = 26562816.

The previous prime is 66644971. The next prime is 66644999. The reversal of 66644998 is 89944666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66644999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 181411 + ... + 181777.

It is an arithmetic number, because the mean of its divisors is an integer number (2595780).

Almost surely, 2^66644998 is an apocalyptic number.

66644998 is a deficient number, since it is larger than the sum of its proper divisors (57952442).

66644998 is a wasteful number, since it uses less digits than its factorization.

66644998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 502 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 52.

The square root of 66644998 is about 8163.6387720183. The cubic root of 66644998 is about 405.4361972085.

The spelling of 66644998 in words is "sixty-six million, six hundred forty-four thousand, nine hundred ninety-eight".