61646120663 has 2 divisors, whose sum is σ = 61646120664. Its totient is φ = 61646120662.

The previous prime is 61646120629. The next prime is 61646120687. The reversal of 61646120663 is 36602164616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61646120663 - 2³² = 57351153367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61646120663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61642120663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30823060331 + 30823060332.

It is an arithmetic number, because the mean of its divisors is an integer number (30823060332).

Almost surely, 2^61646120663 is an apocalyptic number.

61646120663 is a deficient number, since it is larger than the sum of its proper divisors (1).

61646120663 is an equidigital number, since it uses as much as digits as its factorization.

61646120663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 61646120663 in words is "sixty-one billion, six hundred forty-six million, one hundred twenty thousand, six hundred sixty-three".