661292459 has 2 divisors, whose sum is σ = 661292460. Its totient is φ = 661292458.

The previous prime is 661292407. The next prime is 661292477. The reversal of 661292459 is 954292166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661292459 - 2²⁴ = 644515243 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (661222459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330646229 + 330646230.

It is an arithmetic number, because the mean of its divisors is an integer number (330646230).

Almost surely, 2^661292459 is an apocalyptic number.

661292459 is a deficient number, since it is larger than the sum of its proper divisors (1).

661292459 is an equidigital number, since it uses as much as digits as its factorization.

661292459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 44.

The square root of 661292459 is about 25715.6073037368. The cubic root of 661292459 is about 871.2267272076.

The spelling of 661292459 in words is "six hundred sixty-one million, two hundred ninety-two thousand, four hundred fifty-nine".