161915758903 has 4 divisors (see below), whose sum is σ = 161916575080. Its totient is φ = 161914942728.

The previous prime is 161915758897. The next prime is 161915758967. The reversal of 161915758903 is 309857519161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161915758903 is a prime.

It is a super-2 number, since 2×161915758903² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161915758603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102088 + ... + 578146.

It is an arithmetic number, because the mean of its divisors is an integer number (40479143770).

Almost surely, 2^161915758903 is an apocalyptic number.

161915758903 is a deficient number, since it is larger than the sum of its proper divisors (816177).

161915758903 is an equidigital number, since it uses as much as digits as its factorization.

161915758903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816176.

The product of its (nonzero) digits is 2041200, while the sum is 55.

The spelling of 161915758903 in words is "one hundred sixty-one billion, nine hundred fifteen million, seven hundred fifty-eight thousand, nine hundred three".