129768534757 has 4 divisors (see below), whose sum is σ = 137401977996. Its totient is φ = 122135091520.

The previous prime is 129768534737. The next prime is 129768534767. The reversal of 129768534757 is 757435867921.

It is a Cunningham number, because it is equal to 360234²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 757435867921 = 2969 ⋅255114809.

It can be written as a sum of positive squares in 2 ways, for example, as 101031165316 + 28737369441 = 317854^2 + 169521^2 .

It is a cyclic number.

It is not a de Polignac number, because 129768534757 - 2⁷ = 129768534629 is a prime.

It is a super-2 number, since 2×129768534757² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129768534737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3816721594 + ... + 3816721627.

It is an arithmetic number, because the mean of its divisors is an integer number (34350494499).

Almost surely, 2^129768534757 is an apocalyptic number.

129768534757 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

129768534757 is a deficient number, since it is larger than the sum of its proper divisors (7633443239).

129768534757 is an equidigital number, since it uses as much as digits as its factorization.

129768534757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7633443238.

The product of its digits is 88905600, while the sum is 64.

The spelling of 129768534757 in words is "one hundred twenty-nine billion, seven hundred sixty-eight million, five hundred thirty-four thousand, seven hundred fifty-seven".