161623765253 has 16 divisors (see below), whose sum is σ = 172951412544. Its totient is φ = 150502022400.

The previous prime is 161623765249. The next prime is 161623765361. The reversal of 161623765253 is 352567326161.

It is a cyclic number.

It is not a de Polignac number, because 161623765253 - 2² = 161623765249 is a prime.

It is a super-2 number, since 2×161623765253² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161623765198 and 161623765207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161623705253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1375103 + ... + 1488003.

It is an arithmetic number, because the mean of its divisors is an integer number (10809463284).

Almost surely, 2^161623765253 is an apocalyptic number.

It is an amenable number.

161623765253 is a deficient number, since it is larger than the sum of its proper divisors (11327647291).

161623765253 is a wasteful number, since it uses less digits than its factorization.

161623765253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113812.

The product of its digits is 1360800, while the sum is 47.

The spelling of 161623765253 in words is "one hundred sixty-one billion, six hundred twenty-three million, seven hundred sixty-five thousand, two hundred fifty-three".