99977456129 has 2 divisors, whose sum is σ = 99977456130. Its totient is φ = 99977456128.

The previous prime is 99977456107. The next prime is 99977456153. The reversal of 99977456129 is 92165477999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71036641729 + 28940814400 = 266527^2 + 170120^2 .

It is a cyclic number.

It is not a de Polignac number, because 99977456129 - 2⁸ = 99977455873 is a prime.

It is a super-2 number, since 2×99977456129² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99977456329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49988728064 + 49988728065.

It is an arithmetic number, because the mean of its divisors is an integer number (49988728065).

Almost surely, 2^99977456129 is an apocalyptic number.

It is an amenable number.

99977456129 is a deficient number, since it is larger than the sum of its proper divisors (1).

99977456129 is an equidigital number, since it uses as much as digits as its factorization.

99977456129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77157360, while the sum is 68.

The spelling of 99977456129 in words is "ninety-nine billion, nine hundred seventy-seven million, four hundred fifty-six thousand, one hundred twenty-nine".