51421878082 has 4 divisors (see below), whose sum is σ = 77132817126. Its totient is φ = 25710939040.

The previous prime is 51421878049. The next prime is 51421878083. The reversal of 51421878082 is 28087812415.

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

It can be written as a sum of positive squares in only one way, i.e., 45500729481 + 5921148601 = 213309^2 + 76949^2 .

It is not an unprimeable number, because it can be changed into a prime (51421878083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12855469519 + ... + 12855469522.

Almost surely, 2^51421878082 is an apocalyptic number.

51421878082 is a deficient number, since it is larger than the sum of its proper divisors (25710939044).

51421878082 is a wasteful number, since it uses less digits than its factorization.

51421878082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25710939043.

The product of its (nonzero) digits is 286720, while the sum is 46.

The spelling of 51421878082 in words is "fifty-one billion, four hundred twenty-one million, eight hundred seventy-eight thousand, eighty-two".