51331060342640 has 40 divisors (see below), whose sum is σ = 128525078014368. Its totient is φ = 18953006895360.

The previous prime is 51331060342637. The next prime is 51331060342669. The reversal of 51331060342640 is 4624306013315.

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

It is a junction number, because it is equal to n+sod(n) for n = 51331060342594 and 51331060342603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24678393356 + ... + 24678395435.

Almost surely, 2^{51331060342640} is an apocalyptic number.

It is an amenable number.

51331060342640 is an abundant number, since it is smaller than the sum of its proper divisors (77194017671728).

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

51331060342640 is a wasteful number, since it uses less digits than its factorization.

51331060342640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49356788817 (or 49356788811 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

Adding to 51331060342640 its reverse (4624306013315), we get a palindrome (55955366355955).

The spelling of 51331060342640 in words is "fifty-one trillion, three hundred thirty-one billion, sixty million, three hundred forty-two thousand, six hundred forty".