51002145040 has 80 divisors (see below), whose sum is σ = 147840001920. Its totient is φ = 15896770560.

The previous prime is 51002145023. The next prime is 51002145049. The reversal of 51002145040 is 4054120015.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×51002145040³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (51002145049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4133625 + ... + 4145944.

It is an arithmetic number, because the mean of its divisors is an integer number (1848000024).

Almost surely, 2^51002145040 is an apocalyptic number.

It is an amenable number.

51002145040 is an abundant number, since it is smaller than the sum of its proper divisors (96837856880).

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

51002145040 is a wasteful number, since it uses less digits than its factorization.

51002145040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8279600 (or 8279594 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 51002145040 its reverse (4054120015), we get a palindrome (55056265055).

The spelling of 51002145040 in words is "fifty-one billion, two million, one hundred forty-five thousand, forty".