51505220036 has 12 divisors (see below), whose sum is σ = 90140330028. Its totient is φ = 25750840032.

The previous prime is 51505220027. The next prime is 51505220057. The reversal of 51505220036 is 63002250515.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 23656285636 + 27848934400 = 153806^2 + 166880^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51505219990 and 51505220008.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375911 + ... + 494286.

It is an arithmetic number, because the mean of its divisors is an integer number (7511694169).

Almost surely, 2^51505220036 is an apocalyptic number.

It is an amenable number.

51505220036 is a deficient number, since it is larger than the sum of its proper divisors (38635109992).

51505220036 is a wasteful number, since it uses less digits than its factorization.

51505220036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884998 (or 884996 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The spelling of 51505220036 in words is "fifty-one billion, five hundred five million, two hundred twenty thousand, thirty-six".