51644251503615 has 64 divisors (see below), whose sum is σ = 83226482583552. Its totient is φ = 27345786624000.

The previous prime is 51644251503529. The next prime is 51644251503617. The reversal of 51644251503615 is 51630515244615.

It is not a de Polignac number, because 51644251503615 - 2⁴¹ = 49445228248063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51644251503617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7762547629 + ... + 7762554281.

It is an arithmetic number, because the mean of its divisors is an integer number (1300413790368).

Almost surely, 2^{51644251503615} is an apocalyptic number.

51644251503615 is a deficient number, since it is larger than the sum of its proper divisors (31582231079937).

51644251503615 is a wasteful number, since it uses less digits than its factorization.

51644251503615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13120.

The product of its (nonzero) digits is 2160000, while the sum is 48.

The spelling of 51644251503615 in words is "fifty-one trillion, six hundred forty-four billion, two hundred fifty-one million, five hundred three thousand, six hundred fifteen".