161518477 has 2 divisors, whose sum is σ = 161518478. Its totient is φ = 161518476.

The previous prime is 161518457. The next prime is 161518501. The reversal of 161518477 is 774815161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160123716 + 1394761 = 12654^2 + 1181^2 .

It is a cyclic number.

It is not a de Polignac number, because 161518477 - 2⁷ = 161518349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161518447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80759238 + 80759239.

It is an arithmetic number, because the mean of its divisors is an integer number (80759239).

Almost surely, 2^161518477 is an apocalyptic number.

It is an amenable number.

161518477 is a deficient number, since it is larger than the sum of its proper divisors (1).

161518477 is an equidigital number, since it uses as much as digits as its factorization.

161518477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 40.

The square root of 161518477 is about 12708.9919741890. The cubic root of 161518477 is about 544.5955274060.

The spelling of 161518477 in words is "one hundred sixty-one million, five hundred eighteen thousand, four hundred seventy-seven".