661108927 has 2 divisors, whose sum is σ = 661108928. Its totient is φ = 661108926.

The previous prime is 661108919. The next prime is 661108949. The reversal of 661108927 is 729801166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661108927 - 2³ = 661108919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661108927.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661108907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330554463 + 330554464.

It is an arithmetic number, because the mean of its divisors is an integer number (330554464).

Almost surely, 2^661108927 is an apocalyptic number.

661108927 is a deficient number, since it is larger than the sum of its proper divisors (1).

661108927 is an equidigital number, since it uses as much as digits as its factorization.

661108927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 661108927 is about 25712.0385617321. The cubic root of 661108927 is about 871.1461210268.

The spelling of 661108927 in words is "six hundred sixty-one million, one hundred eight thousand, nine hundred twenty-seven".