15201661509 has 12 divisors (see below), whose sum is σ = 22007527776. Its totient is φ = 10111561512.

The previous prime is 15201661481. The next prime is 15201661523. The reversal of 15201661509 is 90516610251.

15201661509 is a `hidden beast` number, since 1 + 5 + 20 + 16 + 615 + 0 + 9 = 666.

It is not a de Polignac number, because 15201661509 - 2⁹ = 15201660997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15201661609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1902417 + ... + 1910390.

It is an arithmetic number, because the mean of its divisors is an integer number (1833960648).

Almost surely, 2^15201661509 is an apocalyptic number.

It is an amenable number.

15201661509 is a deficient number, since it is larger than the sum of its proper divisors (6805866267).

15201661509 is a wasteful number, since it uses less digits than its factorization.

15201661509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3813256 (or 3813253 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The spelling of 15201661509 in words is "fifteen billion, two hundred one million, six hundred sixty-one thousand, five hundred nine".