161650507 has 4 divisors (see below), whose sum is σ = 162344520. Its totient is φ = 160956496.

The previous prime is 161650493. The next prime is 161650529. The reversal of 161650507 is 705056161.

161650507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161650507 - 2¹⁹ = 161126219 is a prime.

It is a super-2 number, since 2×161650507² = 52261772826714098, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161650007) 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, 346657 + ... + 347122.

It is an arithmetic number, because the mean of its divisors is an integer number (40586130).

Almost surely, 2^161650507 is an apocalyptic number.

161650507 is a deficient number, since it is larger than the sum of its proper divisors (694013).

161650507 is an equidigital number, since it uses as much as digits as its factorization.

161650507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694012.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 161650507 is about 12714.1852668584. The cubic root of 161650507 is about 544.7438765110.

The spelling of 161650507 in words is "one hundred sixty-one million, six hundred fifty thousand, five hundred seven".