64636740401 has 4 divisors (see below), whose sum is σ = 64639998192. Its totient is φ = 64633482612.

The previous prime is 64636740391. The next prime is 64636740409. The reversal of 64636740401 is 10404763646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64636740401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64636740409) 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 3 ways as a sum of consecutive naturals, for example, 1598951 + ... + 1638876.

It is an arithmetic number, because the mean of its divisors is an integer number (16159999548).

Almost surely, 2^64636740401 is an apocalyptic number.

It is an amenable number.

64636740401 is a deficient number, since it is larger than the sum of its proper divisors (3257791).

64636740401 is a wasteful number, since it uses less digits than its factorization.

64636740401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3257790.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 64636740401 in words is "sixty-four billion, six hundred thirty-six million, seven hundred forty thousand, four hundred one".