642520355 has 16 divisors (see below), whose sum is σ = 838447200. Its totient is φ = 470702592.

The previous prime is 642520339. The next prime is 642520357. The reversal of 642520355 is 553025246.

It is a cyclic number.

It is not a de Polignac number, because 642520355 - 2⁴ = 642520339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642520357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99005 + ... + 105294.

It is an arithmetic number, because the mean of its divisors is an integer number (52402950).

Almost surely, 2^642520355 is an apocalyptic number.

642520355 is a deficient number, since it is larger than the sum of its proper divisors (195926845).

642520355 is a wasteful number, since it uses less digits than its factorization.

642520355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204358.

The product of its (nonzero) digits is 36000, while the sum is 32.

The square root of 642520355 is about 25347.9852256545. The cubic root of 642520355 is about 862.9036318453.

The spelling of 642520355 in words is "six hundred forty-two million, five hundred twenty thousand, three hundred fifty-five".