166465975500 has 240 divisors, whose sum is σ = 592472488608. Its totient is φ = 40355280000.

The previous prime is 166465975499. The next prime is 166465975531. The reversal of 166465975500 is 5579564661.

166465975500 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 65 + 9 + 75 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 258670 + ... + 632330.

Almost surely, 2^166465975500 is an apocalyptic number.

166465975500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166465975500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296236244304).

166465975500 is an abundant number, since it is smaller than the sum of its proper divisors (426006513108).

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

166465975500 is a wasteful number, since it uses less digits than its factorization.

166465975500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373703 (or 373682 counting only the distinct ones).

The product of its (nonzero) digits is 6804000, while the sum is 54.

The spelling of 166465975500 in words is "one hundred sixty-six billion, four hundred sixty-five million, nine hundred seventy-five thousand, five hundred".