161505615 has 8 divisors (see below), whose sum is σ = 258409008. Its totient is φ = 86136320.

The previous prime is 161505599. The next prime is 161505623. The reversal of 161505615 is 516505161.

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

It is not a de Polignac number, because 161505615 - 2⁴ = 161505599 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5383506 + ... + 5383535.

It is an arithmetic number, because the mean of its divisors is an integer number (32301126).

Almost surely, 2^161505615 is an apocalyptic number.

161505615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161505615 is a deficient number, since it is larger than the sum of its proper divisors (96903393).

161505615 is a wasteful number, since it uses less digits than its factorization.

161505615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10767049.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 161505615 is about 12708.4859444389. The cubic root of 161505615 is about 544.5810713228.

The spelling of 161505615 in words is "one hundred sixty-one million, five hundred five thousand, six hundred fifteen".