51421878087 has 8 divisors (see below), whose sum is σ = 68823199104. Its totient is φ = 34150904568.

The previous prime is 51421878083. The next prime is 51421878121. The reversal of 51421878087 is 78087812415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51421878087 - 2² = 51421878083 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 32585953 + ... + 32587530.

It is an arithmetic number, because the mean of its divisors is an integer number (8602899888).

Almost surely, 2^51421878087 is an apocalyptic number.

51421878087 is a deficient number, since it is larger than the sum of its proper divisors (17401321017).

51421878087 is a wasteful number, since it uses less digits than its factorization.

51421878087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65173749.

The product of its (nonzero) digits is 1003520, while the sum is 51.

The spelling of 51421878087 in words is "fifty-one billion, four hundred twenty-one million, eight hundred seventy-eight thousand, eighty-seven".