161648758 has 4 divisors (see below), whose sum is σ = 242473140. Its totient is φ = 80824378.

The previous prime is 161648741. The next prime is 161648771. The reversal of 161648758 is 857846161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 857846161 = 5503 ⋅155887.

It is a super-2 number, since 2×161648758² = 52260641925885128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40412188 + ... + 40412191.

It is an arithmetic number, because the mean of its divisors is an integer number (60618285).

Almost surely, 2^161648758 is an apocalyptic number.

161648758 is a deficient number, since it is larger than the sum of its proper divisors (80824382).

161648758 is an equidigital number, since it uses as much as digits as its factorization.

161648758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80824381.

The product of its digits is 322560, while the sum is 46.

The square root of 161648758 is about 12714.1164852301. The cubic root of 161648758 is about 544.7419118600.

The spelling of 161648758 in words is "one hundred sixty-one million, six hundred forty-eight thousand, seven hundred fifty-eight".