55385778279 has 64 divisors (see below), whose sum is σ = 83355238400. Its totient is φ = 32479574400.

The previous prime is 55385778277. The next prime is 55385778293. The reversal of 55385778279 is 97287758355.

It is not a de Polignac number, because 55385778279 - 2¹ = 55385778277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55385778271) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 60266982 + ... + 60267900.

It is an arithmetic number, because the mean of its divisors is an integer number (1302425600).

Almost surely, 2^55385778279 is an apocalyptic number.

55385778279 is a deficient number, since it is larger than the sum of its proper divisors (27969460121).

55385778279 is a wasteful number, since it uses less digits than its factorization.

55385778279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676.

The product of its digits is 148176000, while the sum is 66.

The spelling of 55385778279 in words is "fifty-five billion, three hundred eighty-five million, seven hundred seventy-eight thousand, two hundred seventy-nine".