61948370639 has 2 divisors, whose sum is σ = 61948370640. Its totient is φ = 61948370638.

The previous prime is 61948370581. The next prime is 61948370723. The reversal of 61948370639 is 93607384916.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61948370639 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61948370339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30974185319 + 30974185320.

It is an arithmetic number, because the mean of its divisors is an integer number (30974185320).

Almost surely, 2^61948370639 is an apocalyptic number.

61948370639 is a deficient number, since it is larger than the sum of its proper divisors (1).

61948370639 is an equidigital number, since it uses as much as digits as its factorization.

61948370639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 56.

The spelling of 61948370639 in words is "sixty-one billion, nine hundred forty-eight million, three hundred seventy thousand, six hundred thirty-nine".