161846657 has 6 divisors (see below), whose sum is σ = 188270658. Its totient is φ = 138725664.

The previous prime is 161846611. The next prime is 161846689. The reversal of 161846657 is 756648161.

It can be written as a sum of positive squares in only one way, i.e., 155775361 + 6071296 = 12481^2 + 2464^2 .

It is not a de Polignac number, because 161846657 - 2⁸ = 161846401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161846057) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1651448 + ... + 1651545.

It is an arithmetic number, because the mean of its divisors is an integer number (31378443).

Almost surely, 2^161846657 is an apocalyptic number.

It is an amenable number.

161846657 is a deficient number, since it is larger than the sum of its proper divisors (26424001).

161846657 is an equidigital number, since it uses as much as digits as its factorization.

161846657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3303007 (or 3303000 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 161846657 is about 12721.8967532361. The cubic root of 161846657 is about 544.9641218701.

The spelling of 161846657 in words is "one hundred sixty-one million, eight hundred forty-six thousand, six hundred fifty-seven".