161630779 has 2 divisors, whose sum is σ = 161630780. Its totient is φ = 161630778.

The previous prime is 161630771. The next prime is 161630789. The reversal of 161630779 is 977036161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161630779 - 2³ = 161630771 is a prime.

It is a super-2 number, since 2×161630779² = 52249017440293682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161630771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80815389 + 80815390.

It is an arithmetic number, because the mean of its divisors is an integer number (80815390).

Almost surely, 2^161630779 is an apocalyptic number.

161630779 is a deficient number, since it is larger than the sum of its proper divisors (1).

161630779 is an equidigital number, since it uses as much as digits as its factorization.

161630779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 161630779 is about 12713.4094168323. The cubic root of 161630779 is about 544.7217152352.

It can be divided in two parts, 161630 and 779, that added together give a square (162409 = 403²).

The spelling of 161630779 in words is "one hundred sixty-one million, six hundred thirty thousand, seven hundred seventy-nine".