51616111110001 has 4 divisors (see below), whose sum is σ = 52237991966832. Its totient is φ = 50994230253172.

The previous prime is 51616111109939. The next prime is 51616111110013. The reversal of 51616111110001 is 10001111161615.

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 51616111110001 - 2¹⁵ = 51616111077233 is a prime.

It is a super-2 number, since 2×51616111110001² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51616111110041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310940428291 + ... + 310940428456.

It is an arithmetic number, because the mean of its divisors is an integer number (13059497991708).

Almost surely, 2^{51616111110001} is an apocalyptic number.

It is an amenable number.

51616111110001 is a deficient number, since it is larger than the sum of its proper divisors (621880856831).

51616111110001 is an equidigital number, since it uses as much as digits as its factorization.

51616111110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621880856830.

The product of its (nonzero) digits is 180, while the sum is 25.

Adding to 51616111110001 its reverse (10001111161615), we get a palindrome (61617222271616).

The spelling of 51616111110001 in words is "fifty-one trillion, six hundred sixteen billion, one hundred eleven million, one hundred ten thousand, one".