642448025535 has 32 divisors (see below), whose sum is σ = 1034979379200. Its totient is φ = 340285497728.

The previous prime is 642448025533. The next prime is 642448025623. The reversal of 642448025535 is 535520844246.

It is a cyclic number.

It is not a de Polignac number, because 642448025535 - 2¹ = 642448025533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642448025533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16929052 + ... + 16966958.

It is an arithmetic number, because the mean of its divisors is an integer number (32343105600).

Almost surely, 2^642448025535 is an apocalyptic number.

642448025535 is a deficient number, since it is larger than the sum of its proper divisors (392531353665).

642448025535 is a wasteful number, since it uses less digits than its factorization.

642448025535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45647.

The product of its (nonzero) digits is 4608000, while the sum is 48.

The spelling of 642448025535 in words is "six hundred forty-two billion, four hundred forty-eight million, twenty-five thousand, five hundred thirty-five".