55578138279 has 4 divisors (see below), whose sum is σ = 74104184376. Its totient is φ = 37052092184.

The previous prime is 55578138277. The next prime is 55578138349. The reversal of 55578138279 is 97283187555.

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

It is a cyclic number.

It is not a de Polignac number, because 55578138279 - 2¹ = 55578138277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55578138277) 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, 9263023044 + ... + 9263023049.

It is an arithmetic number, because the mean of its divisors is an integer number (18526046094).

Almost surely, 2^55578138279 is an apocalyptic number.

55578138279 is a deficient number, since it is larger than the sum of its proper divisors (18526046097).

55578138279 is a wasteful number, since it uses less digits than its factorization.

55578138279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18526046096.

The product of its digits is 21168000, while the sum is 60.

The spelling of 55578138279 in words is "fifty-five billion, five hundred seventy-eight million, one hundred thirty-eight thousand, two hundred seventy-nine".