15661064 has 32 divisors (see below), whose sum is σ = 30440280. Its totient is φ = 7547904.

The previous prime is 15661033. The next prime is 15661069. The reversal of 15661064 is 46016651.

15661064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13380964 + 2280100 = 3658^2 + 1510^2 .

It is a super-2 number, since 2×15661064² = 490537851224192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15661069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46304 + ... + 46640.

Almost surely, 2^15661064 is an apocalyptic number.

It is an amenable number.

15661064 is a deficient number, since it is larger than the sum of its proper divisors (14779216).

15661064 is a wasteful number, since it uses less digits than its factorization.

15661064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 533 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 15661064 is about 3957.4062212515. The cubic root of 15661064 is about 250.1921935420.

The spelling of 15661064 in words is "fifteen million, six hundred sixty-one thousand, sixty-four".