51161232021533 has 4 divisors (see below), whose sum is σ = 51161826238848. Its totient is φ = 51160637804220.

The previous prime is 51161232021509. The next prime is 51161232021539. The reversal of 51161232021533 is 33512023216115.

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 51161232021533 - 2¹² = 51161232017437 is a prime.

It is a super-2 number, since 2×51161232021533² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51161232021493 and 51161232021502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51161232021539) 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, 296979491 + ... + 297151712.

It is an arithmetic number, because the mean of its divisors is an integer number (12790456559712).

Almost surely, 2^{51161232021533} is an apocalyptic number.

It is an amenable number.

51161232021533 is a deficient number, since it is larger than the sum of its proper divisors (594217315).

51161232021533 is an equidigital number, since it uses as much as digits as its factorization.

51161232021533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594217314.

The product of its (nonzero) digits is 32400, while the sum is 35.

Adding to 51161232021533 its reverse (33512023216115), we get a palindrome (84673255237648).

The spelling of 51161232021533 in words is "fifty-one trillion, one hundred sixty-one billion, two hundred thirty-two million, twenty-one thousand, five hundred thirty-three".