15955565 has 4 divisors (see below), whose sum is σ = 19146684. Its totient is φ = 12764448.

The previous prime is 15955559. The next prime is 15955579. The reversal of 15955565 is 56555951.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10484644 + 5470921 = 3238^2 + 2339^2 .

It is a cyclic number.

It is not a de Polignac number, because 15955565 - 2⁴ = 15955549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1595552 + ... + 1595561.

It is an arithmetic number, because the mean of its divisors is an integer number (4786671).

Almost surely, 2^15955565 is an apocalyptic number.

It is an amenable number.

15955565 is a deficient number, since it is larger than the sum of its proper divisors (3191119).

15955565 is an equidigital number, since it uses as much as digits as its factorization.

15955565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3191118.

The product of its digits is 168750, while the sum is 41.

The square root of 15955565 is about 3994.4417632505. The cubic root of 15955565 is about 251.7507245684.

The spelling of 15955565 in words is "fifteen million, nine hundred fifty-five thousand, five hundred sixty-five".