64787531642 has 8 divisors (see below), whose sum is σ = 97246393236. Its totient is φ = 32372067232.

The previous prime is 64787531639. The next prime is 64787531657. The reversal of 64787531642 is 24613578746.

It can be written as a sum of positive squares in 2 ways, for example, as 62916190561 + 1871341081 = 250831^2 + 43259^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10845563 + ... + 10851534.

Almost surely, 2^64787531642 is an apocalyptic number.

64787531642 is a deficient number, since it is larger than the sum of its proper divisors (32458861594).

64787531642 is a wasteful number, since it uses less digits than its factorization.

64787531642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21698592.

The product of its digits is 6773760, while the sum is 53.

The spelling of 64787531642 in words is "sixty-four billion, seven hundred eighty-seven million, five hundred thirty-one thousand, six hundred forty-two".