642211655 has 8 divisors (see below), whose sum is σ = 795513984. Its totient is φ = 497196000.

The previous prime is 642211643. The next prime is 642211673. The reversal of 642211655 is 556112246.

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

It is not a de Polignac number, because 642211655 - 2⁴ = 642211639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2071496 + ... + 2071805.

It is an arithmetic number, because the mean of its divisors is an integer number (99439248).

Almost surely, 2^642211655 is an apocalyptic number.

642211655 is a deficient number, since it is larger than the sum of its proper divisors (153302329).

642211655 is a wasteful number, since it uses less digits than its factorization.

642211655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4143337.

The product of its digits is 14400, while the sum is 32.

The square root of 642211655 is about 25341.8952527233. The cubic root of 642211655 is about 862.7654152004.

The spelling of 642211655 in words is "six hundred forty-two million, two hundred eleven thousand, six hundred fifty-five".