636740070521 has 8 divisors (see below), whose sum is σ = 637171435680. Its totient is φ = 636308849088.

The previous prime is 636740070481. The next prime is 636740070557. The reversal of 636740070521 is 125070047636.

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

It is a cyclic number.

It is not a de Polignac number, because 636740070521 - 2⁶ = 636740070457 is a prime.

It is a super-2 number, since 2×636740070521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636740070121) 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, 9700550 + ... + 9765968.

It is an arithmetic number, because the mean of its divisors is an integer number (79646429460).

Almost surely, 2^636740070521 is an apocalyptic number.

It is an amenable number.

636740070521 is a deficient number, since it is larger than the sum of its proper divisors (431365159).

636740070521 is a wasteful number, since it uses less digits than its factorization.

636740070521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71863.

The product of its (nonzero) digits is 211680, while the sum is 41.

The spelling of 636740070521 in words is "six hundred thirty-six billion, seven hundred forty million, seventy thousand, five hundred twenty-one".