161093274781 has 16 divisors (see below), whose sum is σ = 166816465920. Its totient is φ = 155403498240.

The previous prime is 161093274757. The next prime is 161093274787. The reversal of 161093274781 is 187472390161.

It is a cyclic number.

It is not a de Polignac number, because 161093274781 - 2⁷ = 161093274653 is a prime.

It is a super-2 number, since 2×161093274781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161093274787) 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, 29143840 + ... + 29149366.

It is an arithmetic number, because the mean of its divisors is an integer number (10426029120).

Almost surely, 2^161093274781 is an apocalyptic number.

It is an amenable number.

161093274781 is a deficient number, since it is larger than the sum of its proper divisors (5723191139).

161093274781 is a wasteful number, since it uses less digits than its factorization.

161093274781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8364.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 161093274781 in words is "one hundred sixty-one billion, ninety-three million, two hundred seventy-four thousand, seven hundred eighty-one".