66380998 has 4 divisors (see below), whose sum is σ = 99571500. Its totient is φ = 33190498.

The previous prime is 66380969. The next prime is 66381011. The reversal of 66380998 is 89908366.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16595248 + ... + 16595251.

It is an arithmetic number, because the mean of its divisors is an integer number (24892875).

Almost surely, 2^66380998 is an apocalyptic number.

66380998 is a deficient number, since it is larger than the sum of its proper divisors (33190502).

66380998 is a wasteful number, since it uses less digits than its factorization.

66380998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33190501.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 66380998 is about 8147.4534671884. The cubic root of 66380998 is about 404.9001389722.

The spelling of 66380998 in words is "sixty-six million, three hundred eighty thousand, nine hundred ninety-eight".