51404735540 has 48 divisors (see below), whose sum is σ = 108569036352. Its totient is φ = 20444092416.

The previous prime is 51404735539. The next prime is 51404735561. The reversal of 51404735540 is 4553740415.

It is a junction number, because it is equal to n+sod(n) for n = 51404735494 and 51404735503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12763007 + ... + 12767033.

It is an arithmetic number, because the mean of its divisors is an integer number (2261854924).

Almost surely, 2^51404735540 is an apocalyptic number.

It is an amenable number.

51404735540 is an abundant number, since it is smaller than the sum of its proper divisors (57164300812).

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

51404735540 is a wasteful number, since it uses less digits than its factorization.

51404735540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7536 (or 7534 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 38.

The spelling of 51404735540 in words is "fifty-one billion, four hundred four million, seven hundred thirty-five thousand, five hundred forty".