168951557 has 2 divisors, whose sum is σ = 168951558. Its totient is φ = 168951556.

The previous prime is 168951539. The next prime is 168951571. The reversal of 168951557 is 755159861.

168951557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159794881 + 9156676 = 12641^2 + 3026^2 .

It is an emirp because it is prime and its reverse (755159861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168951557 - 2⁸ = 168951301 is a prime.

It is a super-2 number, since 2×168951557² = 57089257225448498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168951527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84475778 + 84475779.

It is an arithmetic number, because the mean of its divisors is an integer number (84475779).

Almost surely, 2^168951557 is an apocalyptic number.

It is an amenable number.

168951557 is a deficient number, since it is larger than the sum of its proper divisors (1).

168951557 is an equidigital number, since it uses as much as digits as its factorization.

168951557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 47.

The square root of 168951557 is about 12998.1366741545. The cubic root of 168951557 is about 552.8246498032.

The spelling of 168951557 in words is "one hundred sixty-eight million, nine hundred fifty-one thousand, five hundred fifty-seven".