101661980 has 24 divisors (see below), whose sum is σ = 243989088. Its totient is φ = 34855488.

The previous prime is 101661971. The next prime is 101661997. The reversal of 101661980 is 89166101.

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, 362939 + ... + 363218.

It is an arithmetic number, because the mean of its divisors is an integer number (10166212).

Almost surely, 2^101661980 is an apocalyptic number.

101661980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101661980 is an abundant number, since it is smaller than the sum of its proper divisors (142327108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101661980 is a wasteful number, since it uses less digits than its factorization.

101661980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726173 (or 726171 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 101661980 is about 10082.7565675266. The cubic root of 101661980 is about 466.7161772867.

The spelling of 101661980 in words is "one hundred one million, six hundred sixty-one thousand, nine hundred eighty".