642041755117 has 8 divisors (see below), whose sum is σ = 734195428736. Its totient is φ = 549996437232.

The previous prime is 642041755097. The next prime is 642041755141. The reversal of 642041755117 is 711557140246.

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

It is a cyclic number.

It is not a de Polignac number, because 642041755117 - 2³¹ = 639894271469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642041755217) 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, 27076233 + ... + 27099934.

It is an arithmetic number, because the mean of its divisors is an integer number (91774428592).

Almost surely, 2^642041755117 is an apocalyptic number.

It is an amenable number.

642041755117 is a deficient number, since it is larger than the sum of its proper divisors (92153673619).

642041755117 is a wasteful number, since it uses less digits than its factorization.

642041755117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54177867.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 642041755117 in words is "six hundred forty-two billion, forty-one million, seven hundred fifty-five thousand, one hundred seventeen".