64157784634 has 16 divisors (see below), whose sum is σ = 96888591360. Its totient is φ = 31862283840.

The previous prime is 64157784601. The next prime is 64157784637. The reversal of 64157784634 is 43648775146.

It is not an unprimeable number, because it can be changed into a prime (64157784637) 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, 10837 + ... + 358375.

It is an arithmetic number, because the mean of its divisors is an integer number (6055536960).

Almost surely, 2^64157784634 is an apocalyptic number.

64157784634 is a deficient number, since it is larger than the sum of its proper divisors (32730806726).

64157784634 is a wasteful number, since it uses less digits than its factorization.

64157784634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348165.

The product of its digits is 13547520, while the sum is 55.

The spelling of 64157784634 in words is "sixty-four billion, one hundred fifty-seven million, seven hundred eighty-four thousand, six hundred thirty-four".