51002205440 has 72 divisors (see below), whose sum is σ = 124237018080. Its totient is φ = 20055074816.

The previous prime is 51002205433. The next prime is 51002205473. The reversal of 51002205440 is 4450220015.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262154 + ... + 413193.

It is an arithmetic number, because the mean of its divisors is an integer number (1725514140).

Almost surely, 2^51002205440 is an apocalyptic number.

It is an amenable number.

51002205440 is an abundant number, since it is smaller than the sum of its proper divisors (73234812640).

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

51002205440 is an equidigital number, since it uses as much as digits as its factorization.

51002205440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675427 (or 675413 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

Adding to 51002205440 its reverse (4450220015), we get a palindrome (55452425455).

The spelling of 51002205440 in words is "fifty-one billion, two million, two hundred five thousand, four hundred forty".