166387292640 has 384 divisors, whose sum is σ = 594737095680. Its totient is φ = 43430639616.

The previous prime is 166387292629. The next prime is 166387292647. The reversal of 166387292640 is 46292783661.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166387292647) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 188433639 + ... + 188434521.

It is an arithmetic number, because the mean of its divisors is an integer number (1548794520).

Almost surely, 2^166387292640 is an apocalyptic number.

166387292640 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 166387292640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297368547840).

166387292640 is an abundant number, since it is smaller than the sum of its proper divisors (428349803040).

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

166387292640 is a wasteful number, since it uses less digits than its factorization.

166387292640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783 (or 1769 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 166387292640 in words is "one hundred sixty-six billion, three hundred eighty-seven million, two hundred ninety-two thousand, six hundred forty".