1630165181 has 4 divisors (see below), whose sum is σ = 1701041952. Its totient is φ = 1559288412.

The previous prime is 1630165177. The next prime is 1630165193. The reversal of 1630165181 is 1815610361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1630165181 - 2² = 1630165177 is a prime.

It is a super-2 number, since 2×1630165181² = 5314877034689525522, which 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 (1630165151) 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, 35438351 + ... + 35438396.

It is an arithmetic number, because the mean of its divisors is an integer number (425260488).

Almost surely, 2^1630165181 is an apocalyptic number.

It is an amenable number.

1630165181 is a deficient number, since it is larger than the sum of its proper divisors (70876771).

1630165181 is an equidigital number, since it uses as much as digits as its factorization.

1630165181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70876770.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 1630165181 is about 40375.3040979260. The cubic root of 1630165181 is about 1176.9116745202.

The spelling of 1630165181 in words is "one billion, six hundred thirty million, one hundred sixty-five thousand, one hundred eighty-one".