166140645 has 32 divisors (see below), whose sum is σ = 291323520. Its totient is φ = 80183040.

The previous prime is 166140641. The next prime is 166140647. The reversal of 166140645 is 546041661.

It is a happy number.

It is not a de Polignac number, because 166140645 - 2² = 166140641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166140641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35587 + ... + 39983.

It is an arithmetic number, because the mean of its divisors is an integer number (9103860).

Almost surely, 2^166140645 is an apocalyptic number.

166140645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166140645 is a deficient number, since it is larger than the sum of its proper divisors (125182875).

166140645 is a wasteful number, since it uses less digits than its factorization.

166140645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4645.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 166140645 is about 12889.5556556462. Note that the first 3 decimals coincide. The cubic root of 166140645 is about 549.7416362278.

The spelling of 166140645 in words is "one hundred sixty-six million, one hundred forty thousand, six hundred forty-five".