129118147957 has 4 divisors (see below), whose sum is σ = 133283249536. Its totient is φ = 124953046380.

The previous prime is 129118147933. The next prime is 129118147967. The reversal of 129118147957 is 759741811921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 759741811921 = 1013 ⋅749991917.

It is a cyclic number.

It is not a de Polignac number, because 129118147957 - 2³¹ = 126970664309 is a prime.

It is a super-2 number, since 2×129118147957² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129118147898 and 129118147907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129118147967) 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, 2082550743 + ... + 2082550804.

It is an arithmetic number, because the mean of its divisors is an integer number (33320812384).

Almost surely, 2^129118147957 is an apocalyptic number.

It is an amenable number.

129118147957 is a deficient number, since it is larger than the sum of its proper divisors (4165101579).

129118147957 is an equidigital number, since it uses as much as digits as its factorization.

129118147957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165101578.

The product of its digits is 1270080, while the sum is 55.

The spelling of 129118147957 in words is "one hundred twenty-nine billion, one hundred eighteen million, one hundred forty-seven thousand, nine hundred fifty-seven".