61501439999 has 2 divisors, whose sum is σ = 61501440000. Its totient is φ = 61501439998.

The previous prime is 61501439963. The next prime is 61501440001. The reversal of 61501439999 is 99993410516.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61501439999 is a prime.

Together with 61501440001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61501409999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30750719999 + 30750720000.

It is an arithmetic number, because the mean of its divisors is an integer number (30750720000).

Almost surely, 2^61501439999 is an apocalyptic number.

61501439999 is a deficient number, since it is larger than the sum of its proper divisors (1).

61501439999 is an equidigital number, since it uses as much as digits as its factorization.

61501439999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2361960, while the sum is 56.

The spelling of 61501439999 in words is "sixty-one billion, five hundred one million, four hundred thirty-nine thousand, nine hundred ninety-nine".