51123015380 has 24 divisors (see below), whose sum is σ = 113008771680. Its totient is φ = 19372932000.

The previous prime is 51123015347. The next prime is 51123015389. The reversal of 51123015380 is 8351032115.

It is a happy number.

It is a super-2 number, since 2×51123015380² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51123015389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67266746 + ... + 67267505.

It is an arithmetic number, because the mean of its divisors is an integer number (4708698820).

Almost surely, 2^51123015380 is an apocalyptic number.

It is an amenable number.

51123015380 is an abundant number, since it is smaller than the sum of its proper divisors (61885756300).

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

51123015380 is a wasteful number, since it uses less digits than its factorization.

51123015380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134534279 (or 134534277 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 51123015380 its reverse (8351032115), we get a palindrome (59474047495).

The spelling of 51123015380 in words is "fifty-one billion, one hundred twenty-three million, fifteen thousand, three hundred eighty".