636716921434 has 16 divisors (see below), whose sum is σ = 1042180706880. Its totient is φ = 289338924160.

The previous prime is 636716921431. The next prime is 636716921437. The reversal of 636716921434 is 434129617636.

It is an interprime number because it is at equal distance from previous prime (636716921431) and next prime (636716921437).

It is not an unprimeable number, because it can be changed into a prime (636716921431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3809239 + ... + 3972874.

It is an arithmetic number, because the mean of its divisors is an integer number (65136294180).

Almost surely, 2^636716921434 is an apocalyptic number.

636716921434 is a deficient number, since it is larger than the sum of its proper divisors (405463785446).

636716921434 is a wasteful number, since it uses less digits than its factorization.

636716921434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7785845.

The product of its digits is 3919104, while the sum is 52.

The spelling of 636716921434 in words is "six hundred thirty-six billion, seven hundred sixteen million, nine hundred twenty-one thousand, four hundred thirty-four".