661434359 has 2 divisors, whose sum is σ = 661434360. Its totient is φ = 661434358.

The previous prime is 661434341. The next prime is 661434377. The reversal of 661434359 is 953434166.

It is a balanced prime because it is at equal distance from previous prime (661434341) and next prime (661434377).

It is a cyclic number.

It is not a de Polignac number, because 661434359 - 2¹⁶ = 661368823 is a prime.

It is a super-2 number, since 2×661434359² = 874990822531481762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661434659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330717179 + 330717180.

It is an arithmetic number, because the mean of its divisors is an integer number (330717180).

Almost surely, 2^661434359 is an apocalyptic number.

661434359 is a deficient number, since it is larger than the sum of its proper divisors (1).

661434359 is an equidigital number, since it uses as much as digits as its factorization.

661434359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 41.

The square root of 661434359 is about 25718.3661806111. The cubic root of 661434359 is about 871.2890386349.

The spelling of 661434359 in words is "six hundred sixty-one million, four hundred thirty-four thousand, three hundred fifty-nine".