56781705381 has 8 divisors (see below), whose sum is σ = 75825958464. Its totient is φ = 37795961280.

The previous prime is 56781705373. The next prime is 56781705391. The reversal of 56781705381 is 18350718765.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56781705381 - 2³ = 56781705373 is a prime.

It is a super-2 number, since 2×56781705381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56781705391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14624980 + ... + 14628861.

It is an arithmetic number, because the mean of its divisors is an integer number (9478244808).

Almost surely, 2^56781705381 is an apocalyptic number.

It is an amenable number.

56781705381 is a deficient number, since it is larger than the sum of its proper divisors (19044253083).

56781705381 is a wasteful number, since it uses less digits than its factorization.

56781705381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29254491.

The product of its (nonzero) digits is 1411200, while the sum is 51.

The spelling of 56781705381 in words is "fifty-six billion, seven hundred eighty-one million, seven hundred five thousand, three hundred eighty-one".