51515421072 has 40 divisors (see below), whose sum is σ = 133093460640. Its totient is φ = 17170264320.

The previous prime is 51515421071. The next prime is 51515421073. The reversal of 51515421072 is 27012451515.

It is an interprime number because it is at equal distance from previous prime (51515421071) and next prime (51515421073).

It is not an unprimeable number, because it can be changed into a prime (51515421071) 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, 574579 + ... + 658157.

It is an arithmetic number, because the mean of its divisors is an integer number (3327336516).

Almost surely, 2^51515421072 is an apocalyptic number.

It is an amenable number.

51515421072 is an abundant number, since it is smaller than the sum of its proper divisors (81578039568).

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

51515421072 is a wasteful number, since it uses less digits than its factorization.

51515421072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96431 (or 96425 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 33.

Adding to 51515421072 its reverse (27012451515), we get a palindrome (78527872587).

The spelling of 51515421072 in words is "fifty-one billion, five hundred fifteen million, four hundred twenty-one thousand, seventy-two".