9961654597 has 2 divisors, whose sum is σ = 9961654598. Its totient is φ = 9961654596.

The previous prime is 9961654531. The next prime is 9961654601. The reversal of 9961654597 is 7954561699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8908716996 + 1052937601 = 94386^2 + 32449^2 .

It is a cyclic number.

It is not a de Polignac number, because 9961654597 - 2²⁷ = 9827436869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9961654517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980827298 + 4980827299.

It is an arithmetic number, because the mean of its divisors is an integer number (4980827299).

Almost surely, 2^9961654597 is an apocalyptic number.

It is an amenable number.

9961654597 is a deficient number, since it is larger than the sum of its proper divisors (1).

9961654597 is an equidigital number, since it uses as much as digits as its factorization.

9961654597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18370800, while the sum is 61.

The square root of 9961654597 is about 99808.0888355247. The cubic root of 9961654597 is about 2151.6774071714.

The spelling of 9961654597 in words is "nine billion, nine hundred sixty-one million, six hundred fifty-four thousand, five hundred ninety-seven".