166291950438 has 24 divisors (see below), whose sum is σ = 360696504168. Its totient is φ = 55369530432.

The previous prime is 166291950401. The next prime is 166291950439. The reversal of 166291950438 is 834059192661.

166291950438 is a `hidden beast` number, since 1 + 6 + 629 + 1 + 9 + 5 + 0 + 4 + 3 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166291950439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5076531 + ... + 5109182.

It is an arithmetic number, because the mean of its divisors is an integer number (15029021007).

Almost surely, 2^166291950438 is an apocalyptic number.

166291950438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

166291950438 is an abundant number, since it is smaller than the sum of its proper divisors (194404553730).

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

166291950438 is a wasteful number, since it uses less digits than its factorization.

166291950438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10186628 (or 10186625 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 166291950438 in words is "one hundred sixty-six billion, two hundred ninety-one million, nine hundred fifty thousand, four hundred thirty-eight".