161745715 has 8 divisors (see below), whose sum is σ = 195286608. Its totient is φ = 128602080.

The previous prime is 161745707. The next prime is 161745719. The reversal of 161745715 is 517547161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161745715 - 2³ = 161745707 is a prime.

It is a super-2 number, since 2×161745715² = 52323352641722450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161745719) 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, 98416 + ... + 100045.

It is an arithmetic number, because the mean of its divisors is an integer number (24410826).

Almost surely, 2^161745715 is an apocalyptic number.

161745715 is a deficient number, since it is larger than the sum of its proper divisors (33540893).

161745715 is a wasteful number, since it uses less digits than its factorization.

161745715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198629.

The product of its digits is 29400, while the sum is 37.

The square root of 161745715 is about 12717.9288801282. The cubic root of 161745715 is about 544.8508022425.

The spelling of 161745715 in words is "one hundred sixty-one million, seven hundred forty-five thousand, seven hundred fifteen".