642406473446 has 16 divisors (see below), whose sum is σ = 994742415360. Its totient is φ = 310826679240.

The previous prime is 642406473427. The next prime is 642406473463. The reversal of 642406473446 is 644374604246.

It is a super-2 number, since 2×642406473446² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642406473394 and 642406473403.

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, 1085225 + ... + 1569243.

It is an arithmetic number, because the mean of its divisors is an integer number (62171400960).

Almost surely, 2^642406473446 is an apocalyptic number.

642406473446 is a deficient number, since it is larger than the sum of its proper divisors (352335941914).

642406473446 is a wasteful number, since it uses less digits than its factorization.

642406473446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505459.

The product of its (nonzero) digits is 9289728, while the sum is 50.

The spelling of 642406473446 in words is "six hundred forty-two billion, four hundred six million, four hundred seventy-three thousand, four hundred forty-six".