661025179 has 2 divisors, whose sum is σ = 661025180. Its totient is φ = 661025178.

The previous prime is 661025117. The next prime is 661025207. The reversal of 661025179 is 971520166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661025179 - 2⁷ = 661025051 is a prime.

It is not a weakly prime, because it can be changed into another prime (661025879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330512589 + 330512590.

It is an arithmetic number, because the mean of its divisors is an integer number (330512590).

Almost surely, 2^661025179 is an apocalyptic number.

661025179 is a deficient number, since it is larger than the sum of its proper divisors (1).

661025179 is an equidigital number, since it uses as much as digits as its factorization.

661025179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 661025179 is about 25710.4099344993. The cubic root of 661025179 is about 871.1093344383.

The spelling of 661025179 in words is "six hundred sixty-one million, twenty-five thousand, one hundred seventy-nine".