51121257572 has 36 divisors (see below), whose sum is σ = 112382276160. Its totient is φ = 19917371760.

The previous prime is 51121257571. The next prime is 51121257589. The reversal of 51121257572 is 27575212115.

It is a happy number.

51121257572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51121257572² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51121257571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7541072 + ... + 7547847.

Almost surely, 2^51121257572 is an apocalyptic number.

It is an amenable number.

51121257572 is an abundant number, since it is smaller than the sum of its proper divisors (61261018588).

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

51121257572 is a wasteful number, since it uses less digits than its factorization.

51121257572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15088952 (or 15088939 counting only the distinct ones).

The product of its digits is 49000, while the sum is 38.

Adding to 51121257572 its reverse (27575212115), we get a palindrome (78696469687).

The spelling of 51121257572 in words is "fifty-one billion, one hundred twenty-one million, two hundred fifty-seven thousand, five hundred seventy-two".