51273149365 has 4 divisors (see below), whose sum is σ = 61527779244. Its totient is φ = 41018519488.

The previous prime is 51273149351. The next prime is 51273149377. The reversal of 51273149365 is 56394137215.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15654513924 + 35618635441 = 125118^2 + 188729^2 .

It is a cyclic number.

It is not a de Polignac number, because 51273149365 - 2⁷ = 51273149237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5127314932 + ... + 5127314941.

It is an arithmetic number, because the mean of its divisors is an integer number (15381944811).

Almost surely, 2^51273149365 is an apocalyptic number.

It is an amenable number.

51273149365 is a deficient number, since it is larger than the sum of its proper divisors (10254629879).

51273149365 is a wasteful number, since it uses less digits than its factorization.

51273149365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10254629878.

The product of its digits is 680400, while the sum is 46.

The spelling of 51273149365 in words is "fifty-one billion, two hundred seventy-three million, one hundred forty-nine thousand, three hundred sixty-five".