731885653661 has 2 divisors, whose sum is σ = 731885653662. Its totient is φ = 731885653660.

The previous prime is 731885653627. The next prime is 731885653669. The reversal of 731885653661 is 166356588137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 728786616100 + 3099037561 = 853690^2 + 55669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-731885653661 is a prime.

It is a super-2 number, since 2×731885653661² (a number of 25 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 731885653661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (731885653669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365942826830 + 365942826831.

It is an arithmetic number, because the mean of its divisors is an integer number (365942826831).

Almost surely, 2^731885653661 is an apocalyptic number.

It is an amenable number.

731885653661 is a deficient number, since it is larger than the sum of its proper divisors (1).

731885653661 is an equidigital number, since it uses as much as digits as its factorization.

731885653661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21772800, while the sum is 59.

The spelling of 731885653661 in words is "seven hundred thirty-one billion, eight hundred eighty-five million, six hundred fifty-three thousand, six hundred sixty-one".