21779694255 has 64 divisors (see below), whose sum is σ = 38997697536. Its totient is φ = 10287744000.

The previous prime is 21779694253. The next prime is 21779694269. The reversal of 21779694255 is 55249697712.

It is not a de Polignac number, because 21779694255 - 2¹ = 21779694253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21779694195 and 21779694204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21779694253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5931070 + ... + 5934740.

It is an arithmetic number, because the mean of its divisors is an integer number (609339024).

Almost surely, 2^21779694255 is an apocalyptic number.

21779694255 is a deficient number, since it is larger than the sum of its proper divisors (17218003281).

21779694255 is a wasteful number, since it uses less digits than its factorization.

21779694255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4608.

The product of its digits is 9525600, while the sum is 57.

The spelling of 21779694255 in words is "twenty-one billion, seven hundred seventy-nine million, six hundred ninety-four thousand, two hundred fifty-five".