661432327 has 2 divisors, whose sum is σ = 661432328. Its totient is φ = 661432326.

The previous prime is 661432297. The next prime is 661432339. The reversal of 661432327 is 723234166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661432327 - 2¹¹ = 661430279 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661432292 and 661432301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661432357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330716163 + 330716164.

It is an arithmetic number, because the mean of its divisors is an integer number (330716164).

Almost surely, 2^661432327 is an apocalyptic number.

661432327 is a deficient number, since it is larger than the sum of its proper divisors (1).

661432327 is an equidigital number, since it uses as much as digits as its factorization.

661432327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 34.

The square root of 661432327 is about 25718.3266757385. The cubic root of 661432327 is about 871.2881464017.

The spelling of 661432327 in words is "six hundred sixty-one million, four hundred thirty-two thousand, three hundred twenty-seven".