15722961717961 has 3 divisors (see below), whose sum is σ = 15722965683181. Its totient is φ = 15722957752742.

The previous prime is 15722961717943. The next prime is 15722961717977. The reversal of 15722961717961 is 16971716922751.

The square root of 15722961717961 is 3965219.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 15722961717961 - 2¹⁷ = 15722961586889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15722961717893 and 15722961717902.

It is not an unprimeable number, because it can be changed into a prime (15722961714961) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1982610 + ... + 5947828.

Almost surely, 2^{15722961717961} is an apocalyptic number.

15722961717961 is the 3965219-th square number.

15722961717961 is the 1982610-th centered octagonal number.

It is an amenable number.

15722961717961 is a deficient number, since it is larger than the sum of its proper divisors (3965220).

15722961717961 is an frugal number, since it uses more digits than its factorization.

15722961717961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7930438 (or 3965219 counting only the distinct ones).

The product of its digits is 20003760, while the sum is 64.

The spelling of 15722961717961 in words is "fifteen trillion, seven hundred twenty-two billion, nine hundred sixty-one million, seven hundred seventeen thousand, nine hundred sixty-one".