161625005 has 8 divisors (see below), whose sum is σ = 194018424. Its totient is φ = 129254400.

The previous prime is 161624999. The next prime is 161625029. The reversal of 161625005 is 500526161.

161625005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1779556 + 159845449 = 1334^2 + 12643^2 .

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

It is not a de Polignac number, because 161625005 - 2¹² = 161620909 is a prime.

It is a super-2 number, since 2×161625005² = 52245284482500050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23345 + ... + 29465.

It is an arithmetic number, because the mean of its divisors is an integer number (24252303).

Almost surely, 2^161625005 is an apocalyptic number.

It is an amenable number.

161625005 is a deficient number, since it is larger than the sum of its proper divisors (32393419).

161625005 is an equidigital number, since it uses as much as digits as its factorization.

161625005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11407.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 161625005 is about 12713.1823317374. The cubic root of 161625005 is about 544.7152287218.

The spelling of 161625005 in words is "one hundred sixty-one million, six hundred twenty-five thousand, five".