47513851857821 has 4 divisors (see below), whose sum is σ = 47515064016000. Its totient is φ = 47512639699644.

The previous prime is 47513851857749. The next prime is 47513851857883. The reversal of 47513851857821 is 12875815831574.

It is a happy number.

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 47513851857821 - 2¹⁰ = 47513851856797 is a prime.

It is a super-2 number, since 2×47513851857821² (a number of 28 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 (47513851851821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606020291 + ... + 606098688.

It is an arithmetic number, because the mean of its divisors is an integer number (11878766004000).

Almost surely, 2^{47513851857821} is an apocalyptic number.

It is an amenable number.

47513851857821 is a deficient number, since it is larger than the sum of its proper divisors (1212158179).

47513851857821 is a wasteful number, since it uses less digits than its factorization.

47513851857821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212158178.

The product of its digits is 75264000, while the sum is 65.

The spelling of 47513851857821 in words is "forty-seven trillion, five hundred thirteen billion, eight hundred fifty-one million, eight hundred fifty-seven thousand, eight hundred twenty-one".