661434107 has 2 divisors, whose sum is σ = 661434108. Its totient is φ = 661434106.

The previous prime is 661434101. The next prime is 661434133. The reversal of 661434107 is 701434166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661434107 - 2¹⁸ = 661171963 is a prime.

It is not a weakly prime, because it can be changed into another prime (661434101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330717053 + 330717054.

It is an arithmetic number, because the mean of its divisors is an integer number (330717054).

Almost surely, 2^661434107 is an apocalyptic number.

661434107 is a deficient number, since it is larger than the sum of its proper divisors (1).

661434107 is an equidigital number, since it uses as much as digits as its factorization.

661434107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 661434107 is about 25718.3612813881. The cubic root of 661434107 is about 871.2889279841.

The spelling of 661434107 in words is "six hundred sixty-one million, four hundred thirty-four thousand, one hundred seven".