166850722890 has 24 divisors (see below), whose sum is σ = 433811879748. Its totient is φ = 44493526080.

The previous prime is 166850722879. The next prime is 166850722901. The reversal of 166850722890 is 98227058661.

It is an interprime number because it is at equal distance from previous prime (166850722879) and next prime (166850722901).

It can be written as a sum of positive squares in 2 ways, for example, as 166295130849 + 555592041 = 407793^2 + 23571^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 926948371 + ... + 926948550.

Almost surely, 2^166850722890 is an apocalyptic number.

166850722890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166850722890 is an abundant number, since it is smaller than the sum of its proper divisors (266961156858).

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

166850722890 is a wasteful number, since it uses less digits than its factorization.

166850722890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853896934 (or 1853896931 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 166850722890 in words is "one hundred sixty-six billion, eight hundred fifty million, seven hundred twenty-two thousand, eight hundred ninety".