642651560398 has 8 divisors (see below), whose sum is σ = 964011074400. Its totient is φ = 321314535600.

The previous prime is 642651560387. The next prime is 642651560417. The reversal of 642651560398 is 893065156246.

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

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 3 ways as a sum of consecutive naturals, for example, 5550678 + ... + 5665273.

It is an arithmetic number, because the mean of its divisors is an integer number (120501384300).

Almost surely, 2^642651560398 is an apocalyptic number.

642651560398 is a deficient number, since it is larger than the sum of its proper divisors (321359514002).

642651560398 is a wasteful number, since it uses less digits than its factorization.

642651560398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11244602.

The product of its (nonzero) digits is 9331200, while the sum is 55.

The spelling of 642651560398 in words is "six hundred forty-two billion, six hundred fifty-one million, five hundred sixty thousand, three hundred ninety-eight".