15413717661 has 4 divisors (see below), whose sum is σ = 20551623552. Its totient is φ = 10275811772.

The previous prime is 15413717647. The next prime is 15413717663. The reversal of 15413717661 is 16671731451.

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: 16671731451 = 3 ⋅5557243817.

It is a cyclic number.

It is not a de Polignac number, because 15413717661 - 2⁶ = 15413717597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15413717663) 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, 2568952941 + ... + 2568952946.

It is an arithmetic number, because the mean of its divisors is an integer number (5137905888).

Almost surely, 2^15413717661 is an apocalyptic number.

It is an amenable number.

15413717661 is a deficient number, since it is larger than the sum of its proper divisors (5137905891).

15413717661 is an equidigital number, since it uses as much as digits as its factorization.

15413717661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5137905890.

The product of its digits is 105840, while the sum is 42.

The spelling of 15413717661 in words is "fifteen billion, four hundred thirteen million, seven hundred seventeen thousand, six hundred sixty-one".