72663565602643 has 4 divisors (see below), whose sum is σ = 72734874303960. Its totient is φ = 72592256901328.

The previous prime is 72663565602491. The next prime is 72663565602653. The reversal of 72663565602643 is 34620656536627.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72663565602643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72663565602653) 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, 35654349130 + ... + 35654351167.

It is an arithmetic number, because the mean of its divisors is an integer number (18183718575990).

Almost surely, 2^{72663565602643} is an apocalyptic number.

72663565602643 is a deficient number, since it is larger than the sum of its proper divisors (71308701317).

72663565602643 is a wasteful number, since it uses less digits than its factorization.

72663565602643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71308701316.

The product of its (nonzero) digits is 195955200, while the sum is 61.

The spelling of 72663565602643 in words is "seventy-two trillion, six hundred sixty-three billion, five hundred sixty-five million, six hundred two thousand, six hundred forty-three".