646275404642 has 16 divisors (see below), whose sum is σ = 1113701225472. Its totient is φ = 275525040480.

The previous prime is 646275404623. The next prime is 646275404657. The reversal of 646275404642 is 246404572646.

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, 120841643 + ... + 120846990.

It is an arithmetic number, because the mean of its divisors is an integer number (69606326592).

Almost surely, 2^646275404642 is an apocalyptic number.

646275404642 is a deficient number, since it is larger than the sum of its proper divisors (467425820830).

646275404642 is a wasteful number, since it uses less digits than its factorization.

646275404642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241688833.

The product of its (nonzero) digits is 7741440, while the sum is 50.

The spelling of 646275404642 in words is "six hundred forty-six billion, two hundred seventy-five million, four hundred four thousand, six hundred forty-two".