66981598 has 16 divisors (see below), whose sum is σ = 107155440. Its totient is φ = 31291776.

The previous prime is 66981587. The next prime is 66981611. The reversal of 66981598 is 89518966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2361 + ... + 11812.

It is an arithmetic number, because the mean of its divisors is an integer number (6697215).

Almost surely, 2^66981598 is an apocalyptic number.

66981598 is a deficient number, since it is larger than the sum of its proper divisors (40173842).

66981598 is a wasteful number, since it uses less digits than its factorization.

66981598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14331.

The product of its digits is 933120, while the sum is 52.

The square root of 66981598 is about 8184.2286136202. The cubic root of 66981598 is about 406.1176222576.

The spelling of 66981598 in words is "sixty-six million, nine hundred eighty-one thousand, five hundred ninety-eight".