99680729761 has 2 divisors, whose sum is σ = 99680729762. Its totient is φ = 99680729760.

The previous prime is 99680729719. The next prime is 99680729767. The reversal of 99680729761 is 16792708699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87834584161 + 11846145600 = 296369^2 + 108840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99680729761 is a prime.

It is a super-2 number, since 2×99680729761² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99680729693 and 99680729702.

It is not a weakly prime, because it can be changed into another prime (99680729767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49840364880 + 49840364881.

It is an arithmetic number, because the mean of its divisors is an integer number (49840364881).

Almost surely, 2^99680729761 is an apocalyptic number.

It is an amenable number.

99680729761 is a deficient number, since it is larger than the sum of its proper divisors (1).

99680729761 is an equidigital number, since it uses as much as digits as its factorization.

99680729761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20575296, while the sum is 64.

The spelling of 99680729761 in words is "ninety-nine billion, six hundred eighty million, seven hundred twenty-nine thousand, seven hundred sixty-one".