64536801555766 has 4 divisors (see below), whose sum is σ = 96805202333652. Its totient is φ = 32268400777882.

The previous prime is 64536801555761. The next prime is 64536801555923. The reversal of 64536801555766 is 66755510863546.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64536801555761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16134200388940 + ... + 16134200388943.

It is an arithmetic number, because the mean of its divisors is an integer number (24201300583413).

Almost surely, 2^{64536801555766} is an apocalyptic number.

64536801555766 is a deficient number, since it is larger than the sum of its proper divisors (32268400777886).

64536801555766 is a wasteful number, since it uses less digits than its factorization.

64536801555766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32268400777885.

The product of its (nonzero) digits is 544320000, while the sum is 67.

The spelling of 64536801555766 in words is "sixty-four trillion, five hundred thirty-six billion, eight hundred one million, five hundred fifty-five thousand, seven hundred sixty-six".