545671278561 has 4 divisors (see below), whose sum is σ = 727561704752. Its totient is φ = 363780852372.

The previous prime is 545671278557. The next prime is 545671278569. The reversal of 545671278561 is 165872176545.

It is a happy number.

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 not a de Polignac number, because 545671278561 - 2² = 545671278557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (545671278569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90945213091 + ... + 90945213096.

It is an arithmetic number, because the mean of its divisors is an integer number (181890426188).

Almost surely, 2^545671278561 is an apocalyptic number.

It is an amenable number.

545671278561 is a deficient number, since it is larger than the sum of its proper divisors (181890426191).

545671278561 is a wasteful number, since it uses less digits than its factorization.

545671278561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181890426190.

The product of its digits is 14112000, while the sum is 57.

The spelling of 545671278561 in words is "five hundred forty-five billion, six hundred seventy-one million, two hundred seventy-eight thousand, five hundred sixty-one".