642454511535 has 24 divisors (see below), whose sum is σ = 1179092987280. Its totient is φ = 322486970112.

The previous prime is 642454511533. The next prime is 642454511549. The reversal of 642454511535 is 535115454246.

642454511535 is a `hidden beast` number, since 6 + 4 + 2 + 45 + 451 + 153 + 5 = 666.

It is not a de Polignac number, because 642454511535 - 2¹ = 642454511533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642454511533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 419904145 + ... + 419905674.

It is an arithmetic number, because the mean of its divisors is an integer number (49128874470).

Almost surely, 2^642454511535 is an apocalyptic number.

642454511535 is a deficient number, since it is larger than the sum of its proper divisors (536638475745).

642454511535 is a wasteful number, since it uses less digits than its factorization.

642454511535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839809847 (or 839809844 counting only the distinct ones).

The product of its digits is 1440000, while the sum is 45.

The spelling of 642454511535 in words is "six hundred forty-two billion, four hundred fifty-four million, five hundred eleven thousand, five hundred thirty-five".