166990757 has 4 divisors (see below), whose sum is σ = 170141580. Its totient is φ = 163839936.

The previous prime is 166990723. The next prime is 166990777. The reversal of 166990757 is 757099661.

166990757 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 153784801 + 13205956 = 12401^2 + 3634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166990757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166990717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1575332 + ... + 1575437.

It is an arithmetic number, because the mean of its divisors is an integer number (42535395).

Almost surely, 2^166990757 is an apocalyptic number.

It is an amenable number.

166990757 is a deficient number, since it is larger than the sum of its proper divisors (3150823).

166990757 is an equidigital number, since it uses as much as digits as its factorization.

166990757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3150822.

The product of its (nonzero) digits is 714420, while the sum is 50.

The square root of 166990757 is about 12922.4903559647. The cubic root of 166990757 is about 550.6776847552.

The spelling of 166990757 in words is "one hundred sixty-six million, nine hundred ninety thousand, seven hundred fifty-seven".