65660990 has 16 divisors (see below), whose sum is σ = 118340352. Its totient is φ = 26230944.

The previous prime is 65660981. The next prime is 65661047. The reversal of 65660990 is 9906656.

It is a super-2 number, since 2×65660990² = 8622731215560200, which contains 22 as substring.

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, 5027 + ... + 12513.

It is an arithmetic number, because the mean of its divisors is an integer number (7396272).

Almost surely, 2^65660990 is an apocalyptic number.

65660990 is a deficient number, since it is larger than the sum of its proper divisors (52679362).

65660990 is a wasteful number, since it uses less digits than its factorization.

65660990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8371.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 65660990 is about 8103.1469195616. The cubic root of 65660990 is about 403.4308842809.

The spelling of 65660990 in words is "sixty-five million, six hundred sixty thousand, nine hundred ninety".