21778625683 has 12 divisors (see below), whose sum is σ = 23076868248. Its totient is φ = 20550096000.

The previous prime is 21778625653. The next prime is 21778625689. The reversal of 21778625683 is 38652687712.

It is not a de Polignac number, because 21778625683 - 2¹³ = 21778617491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21778625689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29566 + ... + 210787.

It is an arithmetic number, because the mean of its divisors is an integer number (1923072354).

Almost surely, 2^21778625683 is an apocalyptic number.

21778625683 is a deficient number, since it is larger than the sum of its proper divisors (1298242565).

21778625683 is a wasteful number, since it uses less digits than its factorization.

21778625683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240642 (or 240623 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 55.

The spelling of 21778625683 in words is "twenty-one billion, seven hundred seventy-eight million, six hundred twenty-five thousand, six hundred eighty-three".