99999989999951 has 2 divisors, whose sum is σ = 99999989999952. Its totient is φ = 99999989999950.

The previous prime is 99999989999893. The next prime is 99999989999983. The reversal of 99999989999951 is 15999998999999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99999989999951 - 2¹⁸ = 99999989737807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99999989959951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999994999975 + 49999994999976.

It is an arithmetic number, because the mean of its divisors is an integer number (49999994999976).

Almost surely, 2^{99999989999951} is an apocalyptic number.

99999989999951 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999989999951 is an equidigital number, since it uses as much as digits as its factorization.

99999989999951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1255242384360, while the sum is 113.

The spelling of 99999989999951 in words is "ninety-nine trillion, nine hundred ninety-nine billion, nine hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred fifty-one".