642744447246 has 32 divisors (see below), whose sum is σ = 1558168358400. Its totient is φ = 194771044440.

The previous prime is 642744447217. The next prime is 642744447251.

642744447246 is a `hidden beast` number, since 64 + 2 + 74 + 4 + 4 + 472 + 46 = 666.

642744447246 is nontrivially palindromic in base 10.

642744447246 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 642744447192 and 642744447201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 541030086 + ... + 541031273.

It is an arithmetic number, because the mean of its divisors is an integer number (48692761200).

Almost surely, 2^642744447246 is an apocalyptic number.

642744447246 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

642744447246 is an abundant number, since it is smaller than the sum of its proper divisors (915423911154).

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

642744447246 is a wasteful number, since it uses less digits than its factorization.

642744447246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082061381 (or 1082061375 counting only the distinct ones).

The product of its digits is 28901376, while the sum is 54.

The spelling of 642744447246 in words is "six hundred forty-two billion, seven hundred forty-four million, four hundred forty-seven thousand, two hundred forty-six".