161634012641 has 16 divisors (see below), whose sum is σ = 169679536128. Its totient is φ = 153675997200.

The previous prime is 161634012629. The next prime is 161634012667. The reversal of 161634012641 is 146210436161.

It is a cyclic number.

It is not a de Polignac number, because 161634012641 - 2²⁶ = 161566903777 is a prime.

It is a super-2 number, since 2×161634012641² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161634012601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2656340 + ... + 2716506.

It is an arithmetic number, because the mean of its divisors is an integer number (10604971008).

Almost surely, 2^161634012641 is an apocalyptic number.

It is an amenable number.

161634012641 is a deficient number, since it is larger than the sum of its proper divisors (8045523487).

161634012641 is a wasteful number, since it uses less digits than its factorization.

161634012641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60892.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 161634012641 in words is "one hundred sixty-one billion, six hundred thirty-four million, twelve thousand, six hundred forty-one".