642421236602 has 16 divisors (see below), whose sum is σ = 1037042578152. Its totient is φ = 297359877120.

The previous prime is 642421236581. The next prime is 642421236623. The reversal of 642421236602 is 206632124246.

It is an interprime number because it is at equal distance from previous prime (642421236581) and next prime (642421236623).

It can be written as a sum of positive squares in 4 ways, for example, as 521964345841 + 120456890761 = 722471^2 + 347069^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154872863 + ... + 154877010.

Almost surely, 2^642421236602 is an apocalyptic number.

642421236602 is a deficient number, since it is larger than the sum of its proper divisors (394621341550).

642421236602 is a wasteful number, since it uses less digits than its factorization.

642421236602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309749953.

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 642421236602 in words is "six hundred forty-two billion, four hundred twenty-one million, two hundred thirty-six thousand, six hundred two".