51161640063571 has 4 divisors (see below), whose sum is σ = 51925246631752. Its totient is φ = 50398033495392.

The previous prime is 51161640063557. The next prime is 51161640063587. The reversal of 51161640063571 is 17536004616115.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51161640063571 - 2²⁹ = 51161103192659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51161640043571) 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, 381803283990 + ... + 381803284123.

It is an arithmetic number, because the mean of its divisors is an integer number (12981311657938).

Almost surely, 2^{51161640063571} is an apocalyptic number.

51161640063571 is a deficient number, since it is larger than the sum of its proper divisors (763606568181).

51161640063571 is an equidigital number, since it uses as much as digits as its factorization.

51161640063571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763606568180.

The product of its (nonzero) digits is 453600, while the sum is 46.

Adding to 51161640063571 its reverse (17536004616115), we get a palindrome (68697644679686).

The spelling of 51161640063571 in words is "fifty-one trillion, one hundred sixty-one billion, six hundred forty million, sixty-three thousand, five hundred seventy-one".