129458278257655 has 4 divisors (see below), whose sum is σ = 155349933909192. Its totient is φ = 103566622606120.

The previous prime is 129458278257647. The next prime is 129458278257667. The reversal of 129458278257655 is 556752872854921.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 129458278257655 - 2³ = 129458278257647 is a prime.

It is a super-3 number, since 3×129458278257655³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12945827825761 + ... + 12945827825770.

It is an arithmetic number, because the mean of its divisors is an integer number (38837483477298).

Almost surely, 2^{129458278257655} is an apocalyptic number.

129458278257655 is a deficient number, since it is larger than the sum of its proper divisors (25891655651537).

129458278257655 is an equidigital number, since it uses as much as digits as its factorization.

129458278257655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25891655651536.

The product of its digits is 3386880000, while the sum is 76.

The spelling of 129458278257655 in words is "one hundred twenty-nine trillion, four hundred fifty-eight billion, two hundred seventy-eight million, two hundred fifty-seven thousand, six hundred fifty-five".