51030020553506 has 8 divisors (see below), whose sum is σ = 76644054158364. Its totient is φ = 25482002500720.

The previous prime is 51030020553427. The next prime is 51030020553509. The reversal of 51030020553506 is 60535502003015.

It can be written as a sum of positive squares in 2 ways, for example, as 51010892280481 + 19128273025 = 7142191^2 + 138305^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (51030020553509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16503886085 + ... + 16503889176.

Almost surely, 2^{51030020553506} is an apocalyptic number.

51030020553506 is a deficient number, since it is larger than the sum of its proper divisors (25614033604858).

51030020553506 is a wasteful number, since it uses less digits than its factorization.

51030020553506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33007776036.

The product of its (nonzero) digits is 67500, while the sum is 35.

The spelling of 51030020553506 in words is "fifty-one trillion, thirty billion, twenty million, five hundred fifty-three thousand, five hundred six".