661395697 has 2 divisors, whose sum is σ = 661395698. Its totient is φ = 661395696.

The previous prime is 661395671. The next prime is 661395701. The reversal of 661395697 is 796593166.

661395697 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., 590684416 + 70711281 = 24304^2 + 8409^2 .

It is a cyclic number.

It is not a de Polignac number, because 661395697 - 2²⁷ = 527177969 is a prime.

It is not a weakly prime, because it can be changed into another prime (661395617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330697848 + 330697849.

It is an arithmetic number, because the mean of its divisors is an integer number (330697849).

Almost surely, 2^661395697 is an apocalyptic number.

It is an amenable number.

661395697 is a deficient number, since it is larger than the sum of its proper divisors (1).

661395697 is an equidigital number, since it uses as much as digits as its factorization.

661395697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 52.

The square root of 661395697 is about 25717.6145277901. The cubic root of 661395697 is about 871.2720621793.

The spelling of 661395697 in words is "six hundred sixty-one million, three hundred ninety-five thousand, six hundred ninety-seven".