51485380868 has 6 divisors (see below), whose sum is σ = 90099416526. Its totient is φ = 25742690432.

The previous prime is 51485380861. The next prime is 51485380951. The reversal of 51485380868 is 86808358415.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 41518952644 + 9966428224 = 203762^2 + 99832^2 .

It is not an unprimeable number, because it can be changed into a prime (51485380861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6435672605 + ... + 6435672612.

It is an arithmetic number, because the mean of its divisors is an integer number (15016569421).

Almost surely, 2^51485380868 is an apocalyptic number.

It is an amenable number.

51485380868 is a deficient number, since it is larger than the sum of its proper divisors (38614035658).

51485380868 is a wasteful number, since it uses less digits than its factorization.

51485380868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12871345221 (or 12871345219 counting only the distinct ones).

The product of its (nonzero) digits is 7372800, while the sum is 56.

The spelling of 51485380868 in words is "fifty-one billion, four hundred eighty-five million, three hundred eighty thousand, eight hundred sixty-eight".