166651773624 has 224 divisors, whose sum is σ = 558703825920. Its totient is φ = 45544327488.

The previous prime is 166651773583. The next prime is 166651773643. The reversal of 166651773624 is 426377156661.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 850209 + ... + 1027695.

Almost surely, 2^166651773624 is an apocalyptic number.

166651773624 is a gapful number since it is divisible by the number (14) 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 166651773624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279351912960).

166651773624 is an abundant number, since it is smaller than the sum of its proper divisors (392052052296).

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

166651773624 is a wasteful number, since it uses less digits than its factorization.

166651773624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177541 (or 177522 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The spelling of 166651773624 in words is "one hundred sixty-six billion, six hundred fifty-one million, seven hundred seventy-three thousand, six hundred twenty-four".