51226457640 has 32 divisors (see below), whose sum is σ = 153679373280. Its totient is φ = 13660388672.

The previous prime is 51226457599. The next prime is 51226457651. The reversal of 51226457640 is 4675462215.

It is a junction number, because it is equal to n+sod(n) for n = 51226457592 and 51226457601.

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, 213443454 + ... + 213443693.

It is an arithmetic number, because the mean of its divisors is an integer number (4802480415).

Almost surely, 2^51226457640 is an apocalyptic number.

It is an amenable number.

51226457640 is an abundant number, since it is smaller than the sum of its proper divisors (102452915640).

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

51226457640 is a wasteful number, since it uses less digits than its factorization.

51226457640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426887161 (or 426887157 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 51226457640 in words is "fifty-one billion, two hundred twenty-six million, four hundred fifty-seven thousand, six hundred forty".