16663995 has 64 divisors (see below), whose sum is σ = 32192640. Its totient is φ = 8146944.

The previous prime is 16663987. The next prime is 16664003. The reversal of 16663995 is 59936661.

It is an interprime number because it is at equal distance from previous prime (16663987) and next prime (16664003).

It is not a de Polignac number, because 16663995 - 2³ = 16663987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16663995.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 121567 + ... + 121703.

It is an arithmetic number, because the mean of its divisors is an integer number (503010).

Almost surely, 2^16663995 is an apocalyptic number.

16663995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16663995 is a deficient number, since it is larger than the sum of its proper divisors (15528645).

16663995 is a wasteful number, since it uses less digits than its factorization.

16663995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 215 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 16663995 is about 4082.1556805198. The cubic root of 16663995 is about 255.4228279127.

The spelling of 16663995 in words is "sixteen million, six hundred sixty-three thousand, nine hundred ninety-five".