15120303625661 has 4 divisors (see below), whose sum is σ = 16283403904572. Its totient is φ = 13957203346752.

The previous prime is 15120303625619. The next prime is 15120303625667. The reversal of 15120303625661 is 16652630302151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1467019974436 + 13653283651225 = 1211206^2 + 3695035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15120303625661 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 (15120303625667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581550139436 + ... + 581550139461.

It is an arithmetic number, because the mean of its divisors is an integer number (4070850976143).

Almost surely, 2^{15120303625661} is an apocalyptic number.

It is an amenable number.

15120303625661 is a deficient number, since it is larger than the sum of its proper divisors (1163100278911).

15120303625661 is a wasteful number, since it uses less digits than its factorization.

15120303625661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163100278910.

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 15120303625661 in words is "fifteen trillion, one hundred twenty billion, three hundred three million, six hundred twenty-five thousand, six hundred sixty-one".