47851778557 has 4 divisors (see below), whose sum is σ = 52201940256. Its totient is φ = 43501616860.

The previous prime is 47851778549. The next prime is 47851778561. The reversal of 47851778557 is 75587715874.

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 47851778557 - 2³ = 47851778549 is a prime.

It is a super-2 number, since 2×47851778557² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47851778257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2175080833 + ... + 2175080854.

It is an arithmetic number, because the mean of its divisors is an integer number (13050485064).

Almost surely, 2^47851778557 is an apocalyptic number.

It is an amenable number.

47851778557 is a deficient number, since it is larger than the sum of its proper divisors (4350161699).

47851778557 is a wasteful number, since it uses less digits than its factorization.

47851778557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350161698.

The product of its digits is 76832000, while the sum is 64.

The spelling of 47851778557 in words is "forty-seven billion, eight hundred fifty-one million, seven hundred seventy-eight thousand, five hundred fifty-seven".