642173384501 has 8 divisors (see below), whose sum is σ = 709420540800. Its totient is φ = 576404187840.

The previous prime is 642173384497. The next prime is 642173384533. The reversal of 642173384501 is 105483371246.

It is a happy number.

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 642173384501 - 2² = 642173384497 is a prime.

It is a super-2 number, since 2×642173384501² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642173384701) by changing a digit.

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, 369488996 + ... + 369490733.

It is an arithmetic number, because the mean of its divisors is an integer number (88677567600).

Almost surely, 2^642173384501 is an apocalyptic number.

It is an amenable number.

642173384501 is a deficient number, since it is larger than the sum of its proper divisors (67247156299).

642173384501 is a wasteful number, since it uses less digits than its factorization.

642173384501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738979819.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 642173384501 in words is "six hundred forty-two billion, one hundred seventy-three million, three hundred eighty-four thousand, five hundred one".