56778956729 has 4 divisors (see below), whose sum is σ = 61940680080. Its totient is φ = 51617233380.

The previous prime is 56778956701. The next prime is 56778956743. The reversal of 56778956729 is 92765987765.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56778956729 - 2¹⁶ = 56778891193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56778956749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2580861659 + ... + 2580861680.

It is an arithmetic number, because the mean of its divisors is an integer number (15485170020).

Almost surely, 2^56778956729 is an apocalyptic number.

It is an amenable number.

56778956729 is a deficient number, since it is larger than the sum of its proper divisors (5161723351).

56778956729 is a wasteful number, since it uses less digits than its factorization.

56778956729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5161723350.

The product of its digits is 400075200, while the sum is 71.

The spelling of 56778956729 in words is "fifty-six billion, seven hundred seventy-eight million, nine hundred fifty-six thousand, seven hundred twenty-nine".