356695617661 has 2 divisors, whose sum is σ = 356695617662. Its totient is φ = 356695617660.

The previous prime is 356695617569. The next prime is 356695617721. The reversal of 356695617661 is 166716596653.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232619077636 + 124076540025 = 482306^2 + 352245^2 .

It is a cyclic number.

It is not a de Polignac number, because 356695617661 - 2⁹ = 356695617149 is a prime.

It is a super-2 number, since 2×356695617661² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 356695617661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (356695617361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 178347808830 + 178347808831.

It is an arithmetic number, because the mean of its divisors is an integer number (178347808831).

Almost surely, 2^356695617661 is an apocalyptic number.

It is an amenable number.

356695617661 is a deficient number, since it is larger than the sum of its proper divisors (1).

356695617661 is an equidigital number, since it uses as much as digits as its factorization.

356695617661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36741600, while the sum is 61.

Subtracting from 356695617661 its sum of digits (61), we obtain a square (356695617600 = 597240²).

The spelling of 356695617661 in words is "three hundred fifty-six billion, six hundred ninety-five million, six hundred seventeen thousand, six hundred sixty-one".