161893755 has 32 divisors (see below), whose sum is σ = 288760320. Its totient is φ = 86058720.

The previous prime is 161893751. The next prime is 161893783. The reversal of 161893755 is 557398161.

It is a happy number.

It is not a de Polignac number, because 161893755 - 2² = 161893751 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 161893755.

It is not an unprimeable number, because it can be changed into a prime (161893751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42874 + ... + 46496.

It is an arithmetic number, because the mean of its divisors is an integer number (9023760).

Almost surely, 2^161893755 is an apocalyptic number.

161893755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161893755 is a deficient number, since it is larger than the sum of its proper divisors (126866565).

161893755 is a wasteful number, since it uses less digits than its factorization.

161893755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968 (or 3962 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 161893755 is about 12723.7476790449. The cubic root of 161893755 is about 545.0169789621.

The spelling of 161893755 in words is "one hundred sixty-one million, eight hundred ninety-three thousand, seven hundred fifty-five".