661012463 has 2 divisors, whose sum is σ = 661012464.
Its totient is φ = 661012462.
The previous prime is 661012427. The next prime is 661012477. The reversal of 661012463 is 364210166.
It is a happy number.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 661012463 - 218 = 660750319 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (661012403) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330506231 + 330506232.
It is an arithmetic number, because the mean of its divisors is an integer number (330506232).
Almost surely, 2661012463 is an apocalyptic number.
661012463 is a deficient number, since it is larger than the sum of its proper divisors (1).
661012463 is an equidigital number, since it uses as much as digits as its factorization.
661012463 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 5184, while the sum is 29.
The square root of 661012463 is about 25710.1626404813.
The cubic root of 661012463 is about 871.1037486212.
The spelling of 661012463 in words is "six hundred sixty-one million, twelve thousand, four hundred sixty-three".