511640405442 has 32 divisors (see below), whose sum is σ = 1167707836800. Its totient is φ = 165937428144.

The previous prime is 511640405407. The next prime is 511640405449. The reversal of 511640405442 is 244504046115.

511640405442 is a `hidden beast` number, since 5 + 1 + 1 + 640 + 4 + 0 + 5 + 4 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 511640405397 and 511640405406.

It is not an unprimeable number, because it can be changed into a prime (511640405449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128036142 + ... + 128040137.

It is an arithmetic number, because the mean of its divisors is an integer number (36490869900).

Almost surely, 2^511640405442 is an apocalyptic number.

511640405442 is an abundant number, since it is smaller than the sum of its proper divisors (656067431358).

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

511640405442 is a wasteful number, since it uses less digits than its factorization.

511640405442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256076327 (or 256076321 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The spelling of 511640405442 in words is "five hundred eleven billion, six hundred forty million, four hundred five thousand, four hundred forty-two".