55440457897 has 8 divisors (see below), whose sum is σ = 60620182560. Its totient is φ = 50284013760.

The previous prime is 55440457859. The next prime is 55440457913. The reversal of 55440457897 is 79875404455.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55440457897 - 2³¹ = 53292974249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55440457097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5815147 + ... + 5824672.

It is an arithmetic number, because the mean of its divisors is an integer number (7577522820).

Almost surely, 2^55440457897 is an apocalyptic number.

It is an amenable number.

55440457897 is a deficient number, since it is larger than the sum of its proper divisors (5179724663).

55440457897 is a wasteful number, since it uses less digits than its factorization.

55440457897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11640263.

The product of its (nonzero) digits is 28224000, while the sum is 58.

The spelling of 55440457897 in words is "fifty-five billion, four hundred forty million, four hundred fifty-seven thousand, eight hundred ninety-seven".