55897643129 has 2 divisors, whose sum is σ = 55897643130. Its totient is φ = 55897643128.

The previous prime is 55897643089. The next prime is 55897643177. The reversal of 55897643129 is 92134679855.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31854039529 + 24043603600 = 178477^2 + 155060^2 .

It is a cyclic number.

It is not a de Polignac number, because 55897643129 - 2²⁰ = 55896594553 is a prime.

It is not a weakly prime, because it can be changed into another prime (55897643029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27948821564 + 27948821565.

It is an arithmetic number, because the mean of its divisors is an integer number (27948821565).

Almost surely, 2^55897643129 is an apocalyptic number.

It is an amenable number.

55897643129 is a deficient number, since it is larger than the sum of its proper divisors (1).

55897643129 is an equidigital number, since it uses as much as digits as its factorization.

55897643129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16329600, while the sum is 59.

The spelling of 55897643129 in words is "fifty-five billion, eight hundred ninety-seven million, six hundred forty-three thousand, one hundred twenty-nine".