61646234477 has 2 divisors, whose sum is σ = 61646234478. Its totient is φ = 61646234476.

The previous prime is 61646234473. The next prime is 61646234501. The reversal of 61646234477 is 77443264616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56866033156 + 4780201321 = 238466^2 + 69139^2 .

It is a cyclic number.

It is not a de Polignac number, because 61646234477 - 2² = 61646234473 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61646234471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30823117238 + 30823117239.

It is an arithmetic number, because the mean of its divisors is an integer number (30823117239).

Almost surely, 2^61646234477 is an apocalyptic number.

It is an amenable number.

61646234477 is a deficient number, since it is larger than the sum of its proper divisors (1).

61646234477 is an equidigital number, since it uses as much as digits as its factorization.

61646234477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 50.

The spelling of 61646234477 in words is "sixty-one billion, six hundred forty-six million, two hundred thirty-four thousand, four hundred seventy-seven".