9971910510061 has 4 divisors (see below), whose sum is σ = 9974395415772. Its totient is φ = 9969425604352.

The previous prime is 9971910510049. The next prime is 9971910510097. The reversal of 9971910510061 is 1600150191799.

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 9106024429161 + 865886080900 = 3017619^2 + 930530^2 .

It is a cyclic number.

It is not a de Polignac number, because 9971910510061 - 2²⁵ = 9971876955629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9971910509987 and 9971910510014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9971910510461) 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, 1242446836 + ... + 1242454861.

It is an arithmetic number, because the mean of its divisors is an integer number (2493598853943).

Almost surely, 2^{9971910510061} is an apocalyptic number.

It is an amenable number.

9971910510061 is a deficient number, since it is larger than the sum of its proper divisors (2484905711).

9971910510061 is a wasteful number, since it uses less digits than its factorization.

9971910510061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484905710.

The product of its (nonzero) digits is 153090, while the sum is 49.

The spelling of 9971910510061 in words is "nine trillion, nine hundred seventy-one billion, nine hundred ten million, five hundred ten thousand, sixty-one".