161253585 has 96 divisors (see below), whose sum is σ = 316697472. Its totient is φ = 78382080.

The previous prime is 161253581. The next prime is 161253593. The reversal of 161253585 is 585352161.

It is a happy number.

161253585 is a `hidden beast` number, since 1 + 612 + 5 + 35 + 8 + 5 = 666.

It is not a de Polignac number, because 161253585 - 2² = 161253581 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161253581) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 764130 + ... + 764340.

It is an arithmetic number, because the mean of its divisors is an integer number (3298932).

Almost surely, 2^161253585 is an apocalyptic number.

161253585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161253585 is a deficient number, since it is larger than the sum of its proper divisors (155443887).

161253585 is a wasteful number, since it uses less digits than its factorization.

161253585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 273 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 161253585 is about 12698.5662576529. The cubic root of 161253585 is about 544.2976503764.

The spelling of 161253585 in words is "one hundred sixty-one million, two hundred fifty-three thousand, five hundred eighty-five".