166799640000 has 280 divisors, whose sum is σ = 630264350848. Its totient is φ = 38125440000.

The previous prime is 166799639987. The next prime is 166799640013. The reversal of 166799640000 is 46997661.

It is an interprime number because it is at equal distance from previous prime (166799639987) and next prime (166799640013).

It is a tau number, because it is divible by the number of its divisors (280).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 740715 + ... + 939285.

Almost surely, 2^166799640000 is an apocalyptic number.

166799640000 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 166799640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315132175424).

166799640000 is an abundant number, since it is smaller than the sum of its proper divisors (463464710848).

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

166799640000 is an equidigital number, since it uses as much as digits as its factorization.

166799640000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198613 (or 198588 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The spelling of 166799640000 in words is "one hundred sixty-six billion, seven hundred ninety-nine million, six hundred forty thousand".