161099131651 has 2 divisors, whose sum is σ = 161099131652. Its totient is φ = 161099131650.

The previous prime is 161099131591. The next prime is 161099131657. The reversal of 161099131651 is 156131990161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161099131651 - 2²⁵ = 161065577219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161099131598 and 161099131607.

It is not a weakly prime, because it can be changed into another prime (161099131657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80549565825 + 80549565826.

It is an arithmetic number, because the mean of its divisors is an integer number (80549565826).

Almost surely, 2^161099131651 is an apocalyptic number.

161099131651 is a deficient number, since it is larger than the sum of its proper divisors (1).

161099131651 is an equidigital number, since it uses as much as digits as its factorization.

161099131651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 43.

The spelling of 161099131651 in words is "one hundred sixty-one billion, ninety-nine million, one hundred thirty-one thousand, six hundred fifty-one".