642525351 has 8 divisors (see below), whose sum is σ = 922600560. Its totient is φ = 395400192.

The previous prime is 642525343. The next prime is 642525361. The reversal of 642525351 is 153525246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642525351 - 2³ = 642525343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642525361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8237466 + ... + 8237543.

It is an arithmetic number, because the mean of its divisors is an integer number (115325070).

Almost surely, 2^642525351 is an apocalyptic number.

642525351 is a deficient number, since it is larger than the sum of its proper divisors (280075209).

642525351 is a wasteful number, since it uses less digits than its factorization.

642525351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16475025.

The product of its digits is 36000, while the sum is 33.

The square root of 642525351 is about 25348.0837737293. The cubic root of 642525351 is about 862.9058683790.

The spelling of 642525351 in words is "six hundred forty-two million, five hundred twenty-five thousand, three hundred fifty-one".