51165021061 has 16 divisors (see below), whose sum is σ = 64354681728. Its totient is φ = 39516019200.

The previous prime is 51165020999. The next prime is 51165021101. The reversal of 51165021061 is 16012056115.

It is a happy number.

51165021061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51165021061 - 2¹⁵ = 51164988293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51165021961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2931480 + ... + 2948881.

It is an arithmetic number, because the mean of its divisors is an integer number (4022167608).

Almost surely, 2^51165021061 is an apocalyptic number.

It is an amenable number.

51165021061 is a deficient number, since it is larger than the sum of its proper divisors (13189660667).

51165021061 is a wasteful number, since it uses less digits than its factorization.

51165021061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5880492.

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 51165021061 its reverse (16012056115), we get a palindrome (67177077176).

The spelling of 51165021061 in words is "fifty-one billion, one hundred sixty-five million, twenty-one thousand, sixty-one".