51860072081 has 4 divisors (see below), whose sum is σ = 53532977664. Its totient is φ = 50187166500.

The previous prime is 51860072027. The next prime is 51860072123. The reversal of 51860072081 is 18027006815.

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 51860072081 - 2¹⁴ = 51860055697 is a prime.

It is a super-2 number, since 2×51860072081² (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 (51860072021) 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, 836452745 + ... + 836452806.

It is an arithmetic number, because the mean of its divisors is an integer number (13383244416).

Almost surely, 2^51860072081 is an apocalyptic number.

It is an amenable number.

51860072081 is a deficient number, since it is larger than the sum of its proper divisors (1672905583).

51860072081 is a wasteful number, since it uses less digits than its factorization.

51860072081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672905582.

The product of its (nonzero) digits is 26880, while the sum is 38.

Adding to 51860072081 its reverse (18027006815), we get a palindrome (69887078896).

The spelling of 51860072081 in words is "fifty-one billion, eight hundred sixty million, seventy-two thousand, eighty-one".