56778487766 has 128 divisors (see below), whose sum is σ = 117137664000. Its totient is φ = 19926466560.

The previous prime is 56778487763. The next prime is 56778487837. The reversal of 56778487766 is 66778487765.

It is a self number, because there is not a number n which added to its sum of digits gives 56778487766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56778487763) 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, 21113750 + ... + 21116438.

It is an arithmetic number, because the mean of its divisors is an integer number (915138000).

Almost surely, 2^56778487766 is an apocalyptic number.

56778487766 is an abundant number, since it is smaller than the sum of its proper divisors (60359176234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56778487766 is a wasteful number, since it uses less digits than its factorization.

56778487766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2974.

The product of its digits is 663828480, while the sum is 71.

Subtracting 56778487766 from its reverse (66778487765), we obtain a palindrome (9999999999).

The spelling of 56778487766 in words is "fifty-six billion, seven hundred seventy-eight million, four hundred eighty-seven thousand, seven hundred sixty-six".