15663945 has 16 divisors (see below), whose sum is σ = 27340992. Its totient is φ = 7594560.

The previous prime is 15663941. The next prime is 15663971. The reversal of 15663945 is 54936651.

15663945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15663945 - 2² = 15663941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15663941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47302 + ... + 47631.

It is an arithmetic number, because the mean of its divisors is an integer number (1708812).

Almost surely, 2^15663945 is an apocalyptic number.

15663945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15663945 is a deficient number, since it is larger than the sum of its proper divisors (11677047).

15663945 is a wasteful number, since it uses less digits than its factorization.

15663945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94952.

The product of its digits is 97200, while the sum is 39.

The square root of 15663945 is about 3957.7702055577. The cubic root of 15663945 is about 250.2075343370.

The spelling of 15663945 in words is "fifteen million, six hundred sixty-three thousand, nine hundred forty-five".