15150721665 has 16 divisors (see below), whose sum is σ = 24341746176. Its totient is φ = 8046854400.

The previous prime is 15150721661. The next prime is 15150721727. The reversal of 15150721665 is 56612705151.

It is a happy number.

It is not a de Polignac number, because 15150721665 - 2² = 15150721661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15150721661) 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, 2091921 + ... + 2099150.

It is an arithmetic number, because the mean of its divisors is an integer number (1521359136).

Almost surely, 2^15150721665 is an apocalyptic number.

15150721665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15150721665 is a deficient number, since it is larger than the sum of its proper divisors (9191024511).

15150721665 is a wasteful number, since it uses less digits than its factorization.

15150721665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4191320.

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 15150721665 in words is "fifteen billion, one hundred fifty million, seven hundred twenty-one thousand, six hundred sixty-five".