1661313179 has 2 divisors, whose sum is σ = 1661313180. Its totient is φ = 1661313178.

The previous prime is 1661313133. The next prime is 1661313193. The reversal of 1661313179 is 9713131661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1661313179 is a prime.

It is a super-2 number, since 2×1661313179² = 5519922957438172082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1661313119) 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, 830656589 + 830656590.

It is an arithmetic number, because the mean of its divisors is an integer number (830656590).

Almost surely, 2^1661313179 is an apocalyptic number.

1661313179 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661313179 is an equidigital number, since it uses as much as digits as its factorization.

1661313179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 38.

The square root of 1661313179 is about 40759.2097445473. The cubic root of 1661313179 is about 1184.3602875707.

It can be divided in two parts, 16613 and 13179, that added together give a palindrome (29792).

The spelling of 1661313179 in words is "one billion, six hundred sixty-one million, three hundred thirteen thousand, one hundred seventy-nine".