161661612346 has 16 divisors (see below), whose sum is σ = 261230516064. Its totient is φ = 74588813424.

The previous prime is 161661612341. The next prime is 161661612373. The reversal of 161661612346 is 643216166161.

It is a super-2 number, since 2×161661612346² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161661612341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 928236 + ... + 1088551.

It is an arithmetic number, because the mean of its divisors is an integer number (16326907254).

Almost surely, 2^161661612346 is an apocalyptic number.

161661612346 is a deficient number, since it is larger than the sum of its proper divisors (99568903718).

161661612346 is a wasteful number, since it uses less digits than its factorization.

161661612346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019885.

The product of its digits is 186624, while the sum is 43.

The spelling of 161661612346 in words is "one hundred sixty-one billion, six hundred sixty-one million, six hundred twelve thousand, three hundred forty-six".