51220145133 has 12 divisors (see below), whose sum is σ = 74335295008. Its totient is φ = 33984929160.

The previous prime is 51220145131. The next prime is 51220145239. The reversal of 51220145133 is 33154102215.

51220145133 is a `hidden beast` number, since 5 + 1 + 2 + 201 + 451 + 3 + 3 = 666.

It is not a de Polignac number, because 51220145133 - 2¹ = 51220145131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51220145097 and 51220145106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51220145131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13484185 + ... + 13487982.

Almost surely, 2^51220145133 is an apocalyptic number.

It is an amenable number.

51220145133 is a deficient number, since it is larger than the sum of its proper divisors (23115149875).

51220145133 is a wasteful number, since it uses less digits than its factorization.

51220145133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26972384 (or 26972381 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 51220145133 its reverse (33154102215), we get a palindrome (84374247348).

The spelling of 51220145133 in words is "fifty-one billion, two hundred twenty million, one hundred forty-five thousand, one hundred thirty-three".