642255351 has 8 divisors (see below), whose sum is σ = 858385920. Its totient is φ = 427147512.

The previous prime is 642255349. The next prime is 642255377. The reversal of 642255351 is 153552246.

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

It is not a de Polignac number, because 642255351 - 2¹ = 642255349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642255301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254215 + ... + 256728.

It is an arithmetic number, because the mean of its divisors is an integer number (107298240).

Almost surely, 2^642255351 is an apocalyptic number.

642255351 is a deficient number, since it is larger than the sum of its proper divisors (216130569).

642255351 is a wasteful number, since it uses less digits than its factorization.

642255351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511365.

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

The square root of 642255351 is about 25342.7573677372. The cubic root of 642255351 is about 862.7849822400.

The spelling of 642255351 in words is "six hundred forty-two million, two hundred fifty-five thousand, three hundred fifty-one".