51605620331 has 4 divisors (see below), whose sum is σ = 51811220664. Its totient is φ = 51400020000.

The previous prime is 51605620279. The next prime is 51605620357. The reversal of 51605620331 is 13302650615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13302650615 = 5 ⋅2660530123.

It is a cyclic number.

It is not a de Polignac number, because 51605620331 - 2²² = 51601426027 is a prime.

It is a super-2 number, since 2×51605620331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51605620931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102799790 + ... + 102800291.

It is an arithmetic number, because the mean of its divisors is an integer number (12952805166).

Almost surely, 2^51605620331 is an apocalyptic number.

51605620331 is a deficient number, since it is larger than the sum of its proper divisors (205600333).

51605620331 is a wasteful number, since it uses less digits than its factorization.

51605620331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205600332.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 51605620331 in words is "fifty-one billion, six hundred five million, six hundred twenty thousand, three hundred thirty-one".