51550152320240 has 80 divisors (see below), whose sum is σ = 136978048081920. Its totient is φ = 17674089027840.

The previous prime is 51550152320203. The next prime is 51550152320273. The reversal of 51550152320240 is 4202325105515.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 51550152320240.

It is a congruent number.

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, 41608451 + ... + 42829469.

It is an arithmetic number, because the mean of its divisors is an integer number (1712225601024).

Almost surely, 2^{51550152320240} is an apocalyptic number.

It is an amenable number.

51550152320240 is an abundant number, since it is smaller than the sum of its proper divisors (85427895761680).

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

51550152320240 is a wasteful number, since it uses less digits than its factorization.

51550152320240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296430 (or 1296424 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 51550152320240 its reverse (4202325105515), we get a palindrome (55752477425755).

The spelling of 51550152320240 in words is "fifty-one trillion, five hundred fifty billion, one hundred fifty-two million, three hundred twenty thousand, two hundred forty".