166953890 has 8 divisors (see below), whose sum is σ = 300517020. Its totient is φ = 66781552.

The previous prime is 166953877. The next prime is 166953937. The reversal of 166953890 is 98359661.

166953890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 161976529 + 4977361 = 12727^2 + 2231^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×166953890² = 55747202772264200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8347685 + ... + 8347704.

Almost surely, 2^166953890 is an apocalyptic number.

166953890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166953890 is a deficient number, since it is larger than the sum of its proper divisors (133563130).

166953890 is a wasteful number, since it uses less digits than its factorization.

166953890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16695396.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 166953890 is about 12921.0638106930. The cubic root of 166953890 is about 550.6371569065.

The spelling of 166953890 in words is "one hundred sixty-six million, nine hundred fifty-three thousand, eight hundred ninety".