161277725 has 48 divisors (see below), whose sum is σ = 252626688. Its totient is φ = 99517440.

The previous prime is 161277713. The next prime is 161277761. The reversal of 161277725 is 527772161.

It is a de Polignac number, because none of the positive numbers 2^k-161277725 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67247 + ... + 69603.

It is an arithmetic number, because the mean of its divisors is an integer number (5263056).

Almost surely, 2^161277725 is an apocalyptic number.

It is an amenable number.

161277725 is a deficient number, since it is larger than the sum of its proper divisors (91348963).

161277725 is a wasteful number, since it uses less digits than its factorization.

161277725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414 (or 2409 counting only the distinct ones).

The product of its digits is 41160, while the sum is 38.

The square root of 161277725 is about 12699.5167230883. The cubic root of 161277725 is about 544.3248098546.

The spelling of 161277725 in words is "one hundred sixty-one million, two hundred seventy-seven thousand, seven hundred twenty-five".