61461406639 has 2 divisors, whose sum is σ = 61461406640. Its totient is φ = 61461406638.

The previous prime is 61461406607. The next prime is 61461406661. The reversal of 61461406639 is 93660416416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61461406639 - 2⁵ = 61461406607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61461406339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30730703319 + 30730703320.

It is an arithmetic number, because the mean of its divisors is an integer number (30730703320).

Almost surely, 2^61461406639 is an apocalyptic number.

61461406639 is a deficient number, since it is larger than the sum of its proper divisors (1).

61461406639 is an equidigital number, since it uses as much as digits as its factorization.

61461406639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 46.

The spelling of 61461406639 in words is "sixty-one billion, four hundred sixty-one million, four hundred six thousand, six hundred thirty-nine".