51278196263238 has 80 divisors (see below), whose sum is σ = 131667646160160. Its totient is φ = 14611634509824.

The previous prime is 51278196263237. The next prime is 51278196263249. The reversal of 51278196263238 is 83236269187215.

51278196263238 is a `hidden beast` number, since 5 + 1 + 278 + 19 + 6 + 26 + 323 + 8 = 666.

It is a super-2 number, since 2×51278196263238² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51278196263237) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 60192123 + ... + 61038086.

It is an arithmetic number, because the mean of its divisors is an integer number (1645845577002).

Almost surely, 2^{51278196263238} is an apocalyptic number.

51278196263238 is an abundant number, since it is smaller than the sum of its proper divisors (80389449896922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51278196263238 is a wasteful number, since it uses less digits than its factorization.

51278196263238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121230603 (or 121230594 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 63.

The spelling of 51278196263238 in words is "fifty-one trillion, two hundred seventy-eight billion, one hundred ninety-six million, two hundred sixty-three thousand, two hundred thirty-eight".