51364181956 has 12 divisors (see below), whose sum is σ = 95174807868. Its totient is φ = 24171379712.

The previous prime is 51364181951. The next prime is 51364181959. The reversal of 51364181956 is 65918146315.

It can be written as a sum of positive squares in 2 ways, for example, as 14867900356 + 36496281600 = 121934^2 + 191040^2 .

It is a super-4 number, since 4×51364181956⁴ (a number of 44 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (51364181951) 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, 377677741 + ... + 377677876.

It is an arithmetic number, because the mean of its divisors is an integer number (7931233989).

Almost surely, 2^51364181956 is an apocalyptic number.

It is an amenable number.

51364181956 is a deficient number, since it is larger than the sum of its proper divisors (43810625912).

51364181956 is a wasteful number, since it uses less digits than its factorization.

51364181956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755355638 (or 755355636 counting only the distinct ones).

The product of its digits is 777600, while the sum is 49.

The spelling of 51364181956 in words is "fifty-one billion, three hundred sixty-four million, one hundred eighty-one thousand, nine hundred fifty-six".