101666550 has 48 divisors (see below), whose sum is σ = 252787392. Its totient is φ = 27040800.

The previous prime is 101666527. The next prime is 101666557. The reversal of 101666550 is 55666101.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 85057 + ... + 86243.

It is an arithmetic number, because the mean of its divisors is an integer number (5266404).

Almost surely, 2^101666550 is an apocalyptic number.

101666550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

101666550 is an abundant number, since it is smaller than the sum of its proper divisors (151120842).

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

101666550 is a wasteful number, since it uses less digits than its factorization.

101666550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773 (or 1768 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 101666550 is about 10082.9831895129. The cubic root of 101666550 is about 466.7231705959.

The spelling of 101666550 in words is "one hundred one million, six hundred sixty-six thousand, five hundred fifty".