129543554366 has 4 divisors (see below), whose sum is σ = 194315331552. Its totient is φ = 64771777182.

The previous prime is 129543554353. The next prime is 129543554383. The reversal of 129543554366 is 663455345921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 663455345921 = 29 ⋅22877770549.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32385888590 + ... + 32385888593.

It is an arithmetic number, because the mean of its divisors is an integer number (48578832888).

Almost surely, 2^129543554366 is an apocalyptic number.

129543554366 is a deficient number, since it is larger than the sum of its proper divisors (64771777186).

129543554366 is an equidigital number, since it uses as much as digits as its factorization.

129543554366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64771777185.

The product of its digits is 11664000, while the sum is 53.

The spelling of 129543554366 in words is "one hundred twenty-nine billion, five hundred forty-three million, five hundred fifty-four thousand, three hundred sixty-six".