101666556 has 48 divisors (see below), whose sum is σ = 264139680. Its totient is φ = 33816960.

The previous prime is 101666527. The next prime is 101666557. The reversal of 101666556 is 655666101.

It is a super-2 number, since 2×101666556² = 20672177217802272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 101666556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101666557) 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, 81570 + ... + 82806.

It is an arithmetic number, because the mean of its divisors is an integer number (5502910).

Almost surely, 2^101666556 is an apocalyptic number.

It is an amenable number.

101666556 is an abundant number, since it is smaller than the sum of its proper divisors (162473124).

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

101666556 is a wasteful number, since it uses less digits than its factorization.

101666556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011 (or 2003 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 101666556 is about 10082.9834870439. The cubic root of 101666556 is about 466.7231797773.

The spelling of 101666556 in words is "one hundred one million, six hundred sixty-six thousand, five hundred fifty-six".