51420338138840 has 128 divisors (see below), whose sum is σ = 127495032160320. Its totient is φ = 18509230080000.

The previous prime is 51420338138797. The next prime is 51420338138861. The reversal of 51420338138840 is 4883183302415.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20070590 + ... + 22487090.

Almost surely, 2^{51420338138840} 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 51420338138840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63747516080160).

51420338138840 is an abundant number, since it is smaller than the sum of its proper divisors (76074694021480).

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

51420338138840 is a wasteful number, since it uses less digits than its factorization.

51420338138840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2417013 (or 2417009 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 50.

The spelling of 51420338138840 in words is "fifty-one trillion, four hundred twenty billion, three hundred thirty-eight million, one hundred thirty-eight thousand, eight hundred forty".