642434206466 has 16 divisors (see below), whose sum is σ = 1057359059064. Its totient is φ = 290913602304.

The previous prime is 642434206423. The next prime is 642434206487. The reversal of 642434206466 is 664602434246.

It can be written as a sum of positive squares in 4 ways, for example, as 614218605841 + 28215600625 = 783721^2 + 167975^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 642434206466.

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, 233102471 + ... + 233105226.

Almost surely, 2^642434206466 is an apocalyptic number.

642434206466 is a deficient number, since it is larger than the sum of its proper divisors (414924852598).

642434206466 is a wasteful number, since it uses less digits than its factorization.

642434206466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466207765.

The product of its (nonzero) digits is 3981312, while the sum is 47.

The spelling of 642434206466 in words is "six hundred forty-two billion, four hundred thirty-four million, two hundred six thousand, four hundred sixty-six".