161901766 has 16 divisors (see below), whose sum is σ = 261743328. Its totient is φ = 74664000.

The previous prime is 161901757. The next prime is 161901799. The reversal of 161901766 is 667109161.

161901766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 62191 + ... + 64741.

It is an arithmetic number, because the mean of its divisors is an integer number (16358958).

Almost surely, 2^161901766 is an apocalyptic number.

161901766 is a deficient number, since it is larger than the sum of its proper divisors (99841562).

161901766 is a wasteful number, since it uses less digits than its factorization.

161901766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5007.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 161901766 is about 12724.0624801987. The cubic root of 161901766 is about 545.0259685182.

It can be divided in two parts, 16190 and 1766, that added together give a square (17956 = 134²).

The spelling of 161901766 in words is "one hundred sixty-one million, nine hundred one thousand, seven hundred sixty-six".