51675685840 has 40 divisors (see below), whose sum is σ = 120324617928. Its totient is φ = 20639539200.

The previous prime is 51675685823. The next prime is 51675685871. The reversal of 51675685840 is 4858657615.

It can be written as a sum of positive squares in 4 ways, for example, as 13631963536 + 38043722304 = 116756^2 + 195048^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426061 + ... + 533740.

Almost surely, 2^51675685840 is an apocalyptic number.

It is an amenable number.

51675685840 is an abundant number, since it is smaller than the sum of its proper divisors (68648932088).

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

51675685840 is a wasteful number, since it uses less digits than its factorization.

51675685840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960487 (or 960481 counting only the distinct ones).

The product of its (nonzero) digits is 8064000, while the sum is 55.

The spelling of 51675685840 in words is "fifty-one billion, six hundred seventy-five million, six hundred eighty-five thousand, eight hundred forty".