661180837 has 2 divisors, whose sum is σ = 661180838. Its totient is φ = 661180836.

The previous prime is 661180823. The next prime is 661180841. The reversal of 661180837 is 738081166.

661180837 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., 661055521 + 125316 = 25711^2 + 354^2 .

It is a cyclic number.

It is not a de Polignac number, because 661180837 - 2²⁷ = 526963109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661180837.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661180237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330590418 + 330590419.

It is an arithmetic number, because the mean of its divisors is an integer number (330590419).

Almost surely, 2^661180837 is an apocalyptic number.

It is an amenable number.

661180837 is a deficient number, since it is larger than the sum of its proper divisors (1).

661180837 is an equidigital number, since it uses as much as digits as its factorization.

661180837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 661180837 is about 25713.4368959111. The cubic root of 661180837 is about 871.1777052554.

The spelling of 661180837 in words is "six hundred sixty-one million, one hundred eighty thousand, eight hundred thirty-seven".