161631447751 has 2 divisors, whose sum is σ = 161631447752. Its totient is φ = 161631447750.

The previous prime is 161631447701. The next prime is 161631447763. The reversal of 161631447751 is 157744136161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161631447751 - 2¹⁹ = 161630923463 is a prime.

It is a super-2 number, since 2×161631447751² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161631447701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80815723875 + 80815723876.

It is an arithmetic number, because the mean of its divisors is an integer number (80815723876).

Almost surely, 2^161631447751 is an apocalyptic number.

161631447751 is a deficient number, since it is larger than the sum of its proper divisors (1).

161631447751 is an equidigital number, since it uses as much as digits as its factorization.

161631447751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 46.

The spelling of 161631447751 in words is "one hundred sixty-one billion, six hundred thirty-one million, four hundred forty-seven thousand, seven hundred fifty-one".