51481235857 has 8 divisors (see below), whose sum is σ = 52243810560. Its totient is φ = 50720211360.

The previous prime is 51481235843. The next prime is 51481235863. The reversal of 51481235857 is 75853218415.

51481235857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 51481235857 - 2³⁵ = 17121497489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51481235857.

It is not an unprimeable number, because it can be changed into a prime (51481235867) 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, 320557 + ... + 453562.

It is an arithmetic number, because the mean of its divisors is an integer number (6530476320).

Almost surely, 2^51481235857 is an apocalyptic number.

It is an amenable number.

51481235857 is a deficient number, since it is larger than the sum of its proper divisors (762574703).

51481235857 is an equidigital number, since it uses as much as digits as its factorization.

51481235857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775103.

The product of its digits is 1344000, while the sum is 49.

The spelling of 51481235857 in words is "fifty-one billion, four hundred eighty-one million, two hundred thirty-five thousand, eight hundred fifty-seven".