661930463 has 2 divisors, whose sum is σ = 661930464. Its totient is φ = 661930462.

The previous prime is 661930457. The next prime is 661930471. The reversal of 661930463 is 364039166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661930463 - 2⁴ = 661930447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661930163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330965231 + 330965232.

It is an arithmetic number, because the mean of its divisors is an integer number (330965232).

Almost surely, 2^661930463 is an apocalyptic number.

661930463 is a deficient number, since it is larger than the sum of its proper divisors (1).

661930463 is an equidigital number, since it uses as much as digits as its factorization.

661930463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 661930463 is about 25728.0093089224. The cubic root of 661930463 is about 871.5068188514.

The spelling of 661930463 in words is "six hundred sixty-one million, nine hundred thirty thousand, four hundred sixty-three".