166157401 has 2 divisors, whose sum is σ = 166157402. Its totient is φ = 166157400.

The previous prime is 166157357. The next prime is 166157419. The reversal of 166157401 is 104751661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165791376 + 366025 = 12876^2 + 605^2 .

It is a cyclic number.

It is not a de Polignac number, because 166157401 - 2¹⁹ = 165633113 is a prime.

It is not a weakly prime, because it can be changed into another prime (166157471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83078700 + 83078701.

It is an arithmetic number, because the mean of its divisors is an integer number (83078701).

Almost surely, 2^166157401 is an apocalyptic number.

It is an amenable number.

166157401 is a deficient number, since it is larger than the sum of its proper divisors (1).

166157401 is an equidigital number, since it uses as much as digits as its factorization.

166157401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 166157401 is about 12890.2056228751. The cubic root of 166157401 is about 549.7601168775.

The spelling of 166157401 in words is "one hundred sixty-six million, one hundred fifty-seven thousand, four hundred one".