13680729949 has 2 divisors, whose sum is σ = 13680729950. Its totient is φ = 13680729948.

The previous prime is 13680729917. The next prime is 13680729971. The reversal of 13680729949 is 94992708631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13462960900 + 217769049 = 116030^2 + 14757^2 .

It is a cyclic number.

It is not a de Polignac number, because 13680729949 - 2⁵ = 13680729917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13680729893 and 13680729902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13680721949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6840364974 + 6840364975.

It is an arithmetic number, because the mean of its divisors is an integer number (6840364975).

Almost surely, 2^13680729949 is an apocalyptic number.

It is an amenable number.

13680729949 is a deficient number, since it is larger than the sum of its proper divisors (1).

13680729949 is an equidigital number, since it uses as much as digits as its factorization.

13680729949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The spelling of 13680729949 in words is "thirteen billion, six hundred eighty million, seven hundred twenty-nine thousand, nine hundred forty-nine".