161763649 has 4 divisors (see below), whose sum is σ = 162335536. Its totient is φ = 161191764.

The previous prime is 161763629. The next prime is 161763671. The reversal of 161763649 is 946367161.

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 161763649 - 2⁵ = 161763617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161763629) 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, 285519 + ... + 286084.

It is an arithmetic number, because the mean of its divisors is an integer number (40583884).

Almost surely, 2^161763649 is an apocalyptic number.

It is an amenable number.

161763649 is a deficient number, since it is larger than the sum of its proper divisors (571887).

161763649 is an equidigital number, since it uses as much as digits as its factorization.

161763649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571886.

The product of its digits is 163296, while the sum is 43.

The square root of 161763649 is about 12718.6339282173. The cubic root of 161763649 is about 544.8709387743.

The spelling of 161763649 in words is "one hundred sixty-one million, seven hundred sixty-three thousand, six hundred forty-nine".