642215741078 has 64 divisors (see below), whose sum is σ = 1067235678720. Its totient is φ = 288477504000.

The previous prime is 642215741059. The next prime is 642215741081. The reversal of 642215741078 is 870147512246.

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 31404725 + ... + 31425167.

It is an arithmetic number, because the mean of its divisors is an integer number (16675557480).

Almost surely, 2^642215741078 is an apocalyptic number.

642215741078 is a deficient number, since it is larger than the sum of its proper divisors (425019937642).

642215741078 is a wasteful number, since it uses less digits than its factorization.

642215741078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20853.

The product of its (nonzero) digits is 752640, while the sum is 47.

The spelling of 642215741078 in words is "six hundred forty-two billion, two hundred fifteen million, seven hundred forty-one thousand, seventy-eight".