161266990 has 32 divisors (see below), whose sum is σ = 295938720. Its totient is φ = 63258624.

The previous prime is 161266921. The next prime is 161266993. The reversal of 161266990 is 99662161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161266993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209326 + ... + 210094.

It is an arithmetic number, because the mean of its divisors is an integer number (9248085).

Almost surely, 2^161266990 is an apocalyptic number.

161266990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161266990 is a deficient number, since it is larger than the sum of its proper divisors (134671730).

161266990 is a wasteful number, since it uses less digits than its factorization.

161266990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 161266990 is about 12699.0940621762. The cubic root of 161266990 is about 544.3127324345.

The spelling of 161266990 in words is "one hundred sixty-one million, two hundred sixty-six thousand, nine hundred ninety".