10621665 has 64 divisors (see below), whose sum is σ = 20563200. Its totient is φ = 5184000.

The previous prime is 10621657. The next prime is 10621673. The reversal of 10621665 is 56612601.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (10621657) and next prime (10621673).

It is not a de Polignac number, because 10621665 - 2³ = 10621657 is a prime.

It is a super-2 number, since 2×10621665² = 225639534744450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

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, 105115 + ... + 105215.

It is an arithmetic number, because the mean of its divisors is an integer number (321300).

Almost surely, 2^10621665 is an apocalyptic number.

10621665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10621665 is a deficient number, since it is larger than the sum of its proper divisors (9941535).

10621665 is a wasteful number, since it uses less digits than its factorization.

10621665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 10621665 is about 3259.0895968046. The cubic root of 10621665 is about 219.8184797469.

The spelling of 10621665 in words is "ten million, six hundred twenty-one thousand, six hundred sixty-five".