51256349007644 has 48 divisors (see below), whose sum is σ = 99202684573440. Its totient is φ = 22977053331840.

The previous prime is 51256349007637. The next prime is 51256349007683. The reversal of 51256349007644 is 44670094365215.

It is a self number, because there is not a number n which added to its sum of digits gives 51256349007644.

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, 34144337 + ... + 35613879.

It is an arithmetic number, because the mean of its divisors is an integer number (2066722595280).

Almost surely, 2^{51256349007644} is an apocalyptic number.

It is an amenable number.

51256349007644 is a deficient number, since it is larger than the sum of its proper divisors (47946335565796).

51256349007644 is a wasteful number, since it uses less digits than its factorization.

51256349007644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480490 (or 1480488 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 56.

The spelling of 51256349007644 in words is "fifty-one trillion, two hundred fifty-six billion, three hundred forty-nine million, seven thousand, six hundred forty-four".