51278219700 has 36 divisors (see below), whose sum is σ = 148364983200. Its totient is φ = 13674191840.

The previous prime is 51278219683. The next prime is 51278219701. The reversal of 51278219700 is 791287215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51278219701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85463400 + ... + 85463999.

Almost surely, 2^51278219700 is an apocalyptic number.

51278219700 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51278219700 is an abundant number, since it is smaller than the sum of its proper divisors (97086763500).

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

51278219700 is a wasteful number, since it uses less digits than its factorization.

51278219700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170927416 (or 170927409 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 42.

The spelling of 51278219700 in words is "fifty-one billion, two hundred seventy-eight million, two hundred nineteen thousand, seven hundred".