51377558648640 has 448 divisors, whose sum is σ = 189013850210304. Its totient is φ = 11581485023232.

The previous prime is 51377558648617. The next prime is 51377558648653. The reversal of 51377558648640 is 4684685577315.

It is a tau number, because it is divible by the number of its divisors (448).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 160185712 + ... + 160506128.

It is an arithmetic number, because the mean of its divisors is an integer number (421905915648).

Almost surely, 2^{51377558648640} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51377558648640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94506925105152).

51377558648640 is an abundant number, since it is smaller than the sum of its proper divisors (137636291561664).

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

51377558648640 is a wasteful number, since it uses less digits than its factorization.

51377558648640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320774 (or 320764 counting only the distinct ones).

The product of its (nonzero) digits is 677376000, while the sum is 69.

The spelling of 51377558648640 in words is "fifty-one trillion, three hundred seventy-seven billion, five hundred fifty-eight million, six hundred forty-eight thousand, six hundred forty".