63664402001623 has 4 divisors (see below), whose sum is σ = 63937639778688. Its totient is φ = 63391164224560.

The previous prime is 63664402001611. The next prime is 63664402001647. The reversal of 63664402001623 is 32610020446636.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 63664402001623 - 2⁴¹ = 61465378746071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63664402001623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63664402001023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136618888183 + ... + 136618888648.

It is an arithmetic number, because the mean of its divisors is an integer number (15984409944672).

Almost surely, 2^{63664402001623} is an apocalyptic number.

63664402001623 is a deficient number, since it is larger than the sum of its proper divisors (273237777065).

63664402001623 is a wasteful number, since it uses less digits than its factorization.

63664402001623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273237777064.

The product of its (nonzero) digits is 746496, while the sum is 43.

The spelling of 63664402001623 in words is "sixty-three trillion, six hundred sixty-four billion, four hundred two million, one thousand, six hundred twenty-three".