161615253 has 8 divisors (see below), whose sum is σ = 215708416. Its totient is φ = 107632800.

The previous prime is 161615249. The next prime is 161615257. The reversal of 161615253 is 352516161.

It is an interprime number because it is at equal distance from previous prime (161615249) and next prime (161615257).

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

It is not a de Polignac number, because 161615253 - 2² = 161615249 is a prime.

It is a super-2 number, since 2×161615253² = 52238980004508018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161615253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161615257) 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, 24208 + ... + 30153.

It is an arithmetic number, because the mean of its divisors is an integer number (26963552).

Almost surely, 2^161615253 is an apocalyptic number.

It is an amenable number.

161615253 is a deficient number, since it is larger than the sum of its proper divisors (54093163).

161615253 is an equidigital number, since it uses as much as digits as its factorization.

161615253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55355.

The product of its digits is 5400, while the sum is 30.

The square root of 161615253 is about 12712.7987870492. The cubic root of 161615253 is about 544.7042729712.

The spelling of 161615253 in words is "one hundred sixty-one million, six hundred fifteen thousand, two hundred fifty-three".