801663548543 has 48 divisors (see below), whose sum is σ = 967575012768. Its totient is φ = 659539795200.

The previous prime is 801663548533. The next prime is 801663548551. The reversal of 801663548543 is 345845366108.

It is a happy number.

It is not a de Polignac number, because 801663548543 - 2⁴ = 801663548527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (801663548513) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 148977713 + ... + 148983093.

It is an arithmetic number, because the mean of its divisors is an integer number (20157812766).

Almost surely, 2^801663548543 is an apocalyptic number.

801663548543 is a deficient number, since it is larger than the sum of its proper divisors (165911464225).

801663548543 is a wasteful number, since it uses less digits than its factorization.

801663548543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7256 (or 7245 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 53.

The spelling of 801663548543 in words is "eight hundred one billion, six hundred sixty-three million, five hundred forty-eight thousand, five hundred forty-three".