61889000647 has 2 divisors, whose sum is σ = 61889000648. Its totient is φ = 61889000646.

The previous prime is 61889000587. The next prime is 61889000669. The reversal of 61889000647 is 74600098816.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61889000647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61889000647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61889000347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30944500323 + 30944500324.

It is an arithmetic number, because the mean of its divisors is an integer number (30944500324).

Almost surely, 2^61889000647 is an apocalyptic number.

61889000647 is a deficient number, since it is larger than the sum of its proper divisors (1).

61889000647 is an equidigital number, since it uses as much as digits as its factorization.

61889000647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 61889000647 in words is "sixty-one billion, eight hundred eighty-nine million, six hundred forty-seven", and thus it is an aban number.