166657365540 has 144 divisors (see below), whose sum is σ = 524429767680. Its totient is φ = 44426776320.

The previous prime is 166657365533. The next prime is 166657365571. The reversal of 166657365540 is 45563756661.

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 47 ways as a sum of consecutive naturals, for example, 27412221 + ... + 27418299.

Almost surely, 2^166657365540 is an apocalyptic number.

166657365540 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 166657365540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262214883840).

166657365540 is an abundant number, since it is smaller than the sum of its proper divisors (357772402140).

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

166657365540 is a wasteful number, since it uses less digits than its factorization.

166657365540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11744 (or 11730 counting only the distinct ones).

The product of its (nonzero) digits is 13608000, while the sum is 54.

The spelling of 166657365540 in words is "one hundred sixty-six billion, six hundred fifty-seven million, three hundred sixty-five thousand, five hundred forty".