642214655 has 16 divisors (see below), whose sum is σ = 780827040. Its totient is φ = 507015168.

The previous prime is 642214637. The next prime is 642214673. The reversal of 642214655 is 556412246.

It is an interprime number because it is at equal distance from previous prime (642214637) and next prime (642214673).

It is a cyclic number.

It is not a de Polignac number, because 642214655 - 2¹² = 642210559 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302879 + ... + 304991.

It is an arithmetic number, because the mean of its divisors is an integer number (48801690).

Almost surely, 2^642214655 is an apocalyptic number.

642214655 is a deficient number, since it is larger than the sum of its proper divisors (138612385).

642214655 is a wasteful number, since it uses less digits than its factorization.

642214655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2890.

The product of its digits is 57600, while the sum is 35.

The square root of 642214655 is about 25341.9544431758. The cubic root of 642214655 is about 862.7667586268.

The spelling of 642214655 in words is "six hundred forty-two million, two hundred fourteen thousand, six hundred fifty-five".