15120432661 has 4 divisors (see below), whose sum is σ = 15154876000. Its totient is φ = 15085989324.

The previous prime is 15120432659. The next prime is 15120432673. The reversal of 15120432661 is 16623402151.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16623402151 = 82003 ⋅202717.

It is a cyclic number.

It is not a de Polignac number, because 15120432661 - 2¹ = 15120432659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15120432611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17221011 + ... + 17221888.

It is an arithmetic number, because the mean of its divisors is an integer number (3788719000).

Almost surely, 2^15120432661 is an apocalyptic number.

It is an amenable number.

15120432661 is a deficient number, since it is larger than the sum of its proper divisors (34443339).

15120432661 is an equidigital number, since it uses as much as digits as its factorization.

15120432661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34443338.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 15120432661 in words is "fifteen billion, one hundred twenty million, four hundred thirty-two thousand, six hundred sixty-one".