55894491997 has 4 divisors (see below), whose sum is σ = 55895975836. Its totient is φ = 55893008160.

The previous prime is 55894491971. The next prime is 55894492007. The reversal of 55894491997 is 79919449855.

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

It can be written as a sum of positive squares in 2 ways, for example, as 881258596 + 55013233401 = 29686^2 + 234549^2 .

It is a cyclic number.

It is not a de Polignac number, because 55894491997 - 2¹⁹ = 55893967709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55894491907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 683904 + ... + 761257.

It is an arithmetic number, because the mean of its divisors is an integer number (13973993959).

Almost surely, 2^55894491997 is an apocalyptic number.

It is an amenable number.

55894491997 is a deficient number, since it is larger than the sum of its proper divisors (1483839).

55894491997 is a wasteful number, since it uses less digits than its factorization.

55894491997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483838.

The product of its digits is 146966400, while the sum is 70.

The spelling of 55894491997 in words is "fifty-five billion, eight hundred ninety-four million, four hundred ninety-one thousand, nine hundred ninety-seven".