55400449129 has 9 divisors (see below), whose sum is σ = 56478180549. Its totient is φ = 54342918240.

The previous prime is 55400449103. The next prime is 55400449219. The reversal of 55400449129 is 92194400455.

The square root of 55400449129 is 235373.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 713691225 + 54686757904 = 26715^2 + 233852^2 .

It is not a de Polignac number, because 55400449129 - 2¹³ = 55400440937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55400440129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12472549 + ... + 12476989.

Almost surely, 2^55400449129 is an apocalyptic number.

55400449129 is the 235373-rd square number.

55400449129 is the 117687-th centered octagonal number.

It is an amenable number.

55400449129 is a deficient number, since it is larger than the sum of its proper divisors (1077731420).

55400449129 is an frugal number, since it uses more digits than its factorization.

55400449129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8988 (or 4494 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 55400449129 in words is "fifty-five billion, four hundred million, four hundred forty-nine thousand, one hundred twenty-nine".