51420345255040 has 128 divisors (see below), whose sum is σ = 123040904454000. Its totient is φ = 20549048205312.

The previous prime is 51420345254969. The next prime is 51420345255073. The reversal of 51420345255040 is 4055254302415.

It can be written as a sum of positive squares in 8 ways, for example, as 16019654031936 + 35400691223104 = 4002456^2 + 5949848^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×51420345255040² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 51420345254984 and 51420345255002.

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, 5901561724 + ... + 5901570436.

Almost surely, 2^{51420345255040} is an apocalyptic number.

It is an amenable number.

51420345255040 is an abundant number, since it is smaller than the sum of its proper divisors (71620559198960).

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

51420345255040 is a wasteful number, since it uses less digits than its factorization.

51420345255040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16234 (or 16222 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 40.

Adding to 51420345255040 its reverse (4055254302415), we get a palindrome (55475599557455).

The spelling of 51420345255040 in words is "fifty-one trillion, four hundred twenty billion, three hundred forty-five million, two hundred fifty-five thousand, forty".