166064091840 has 224 divisors, whose sum is σ = 616671360000. Its totient is φ = 41952992256.

The previous prime is 166064091799. The next prime is 166064091871. The reversal of 166064091840 is 48190460661.

166064091840 is a `hidden beast` number, since 1 + 6 + 60 + 6 + 409 + 184 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341640 + ... + 669959.

Almost surely, 2^166064091840 is an apocalyptic number.

166064091840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166064091840 is an abundant number, since it is smaller than the sum of its proper divisors (450607268160).

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

166064091840 is a wasteful number, since it uses less digits than its factorization.

166064091840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011644 (or 1011628 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 166064091840 in words is "one hundred sixty-six billion, sixty-four million, ninety-one thousand, eight hundred forty".