161708477 has 12 divisors (see below), whose sum is σ = 189159516. Its totient is φ = 137833920.

The previous prime is 161708473. The next prime is 161708479. The reversal of 161708477 is 774807161.

It can be written as a sum of positive squares in 2 ways, for example, as 39075001 + 122633476 = 6251^2 + 11074^2 .

It is not a de Polignac number, because 161708477 - 2² = 161708473 is a prime.

It is a super-2 number, since 2×161708477² = 52299263067319058, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161708473) 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 11 ways as a sum of consecutive naturals, for example, 248 + ... + 17985.

It is an arithmetic number, because the mean of its divisors is an integer number (15763293).

Almost surely, 2^161708477 is an apocalyptic number.

It is an amenable number.

161708477 is a deficient number, since it is larger than the sum of its proper divisors (27451039).

161708477 is a wasteful number, since it uses less digits than its factorization.

161708477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18428 (or 18421 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 41.

The square root of 161708477 is about 12716.4647996210. The cubic root of 161708477 is about 544.8089861705.

It can be divided in two parts, 1617084 and 77, that added together give a palindrome (1617161).

The spelling of 161708477 in words is "one hundred sixty-one million, seven hundred eight thousand, four hundred seventy-seven".