51553433213 has 4 divisors (see below), whose sum is σ = 51564493728. Its totient is φ = 51542372700.

The previous prime is 51553433201. The next prime is 51553433263. The reversal of 51553433213 is 31233435515.

It is a happy number.

51553433213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51553433213 - 2¹² = 51553429117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51553433263) 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, 5523263 + ... + 5532588.

It is an arithmetic number, because the mean of its divisors is an integer number (12891123432).

Almost surely, 2^51553433213 is an apocalyptic number.

It is an amenable number.

51553433213 is a deficient number, since it is larger than the sum of its proper divisors (11060515).

51553433213 is a wasteful number, since it uses less digits than its factorization.

51553433213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11060514.

The product of its digits is 81000, while the sum is 35.

Adding to 51553433213 its reverse (31233435515), we get a palindrome (82786868728).

The spelling of 51553433213 in words is "fifty-one billion, five hundred fifty-three million, four hundred thirty-three thousand, two hundred thirteen".