642527867521887 has 16 divisors (see below), whose sum is σ = 871567290789888. Its totient is φ = 420933389942880.

The previous prime is 642527867521877. The next prime is 642527867521919. The reversal of 642527867521887 is 788125768725246.

It is a happy number.

It is not a de Polignac number, because 642527867521887 - 2⁴ = 642527867521871 is a prime.

It is a super-3 number, since 3×642527867521887³ (a number of 45 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642527867521807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1651301823 + ... + 1651690880.

It is an arithmetic number, because the mean of its divisors is an integer number (54472955674368).

Almost surely, 2^{642527867521887} is an apocalyptic number.

642527867521887 is a deficient number, since it is larger than the sum of its proper divisors (229039423268001).

642527867521887 is a wasteful number, since it uses less digits than its factorization.

642527867521887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3302993830.

The product of its digits is 5057740800, while the sum is 78.

The spelling of 642527867521887 in words is "six hundred forty-two trillion, five hundred twenty-seven billion, eight hundred sixty-seven million, five hundred twenty-one thousand, eight hundred eighty-seven".