166538888890 has 32 divisors (see below), whose sum is σ = 330259680000. Its totient is φ = 59959992000.

The previous prime is 166538888869. The next prime is 166538888897. The reversal of 166538888890 is 98888835661.

It is not an unprimeable number, because it can be changed into a prime (166538888897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7483890 + ... + 7506109.

It is an arithmetic number, because the mean of its divisors is an integer number (10320615000).

Almost surely, 2^166538888890 is an apocalyptic number.

166538888890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166538888890 is a deficient number, since it is larger than the sum of its proper divisors (163720791110).

166538888890 is a wasteful number, since it uses less digits than its factorization.

166538888890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14990118.

The product of its (nonzero) digits is 159252480, while the sum is 70.

The spelling of 166538888890 in words is "one hundred sixty-six billion, five hundred thirty-eight million, eight hundred eighty-eight thousand, eight hundred ninety".