276645545542021 has 4 divisors (see below), whose sum is σ = 276870643627500. Its totient is φ = 276420447456544.

The previous prime is 276645545541973. The next prime is 276645545542039. The reversal of 276645545542021 is 120245545546672.

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

It can be written as a sum of positive squares in 2 ways, for example, as 239621545521796 + 37024000020225 = 15479714^2 + 6084735^2 .

It is a cyclic number.

It is not a de Polignac number, because 276645545542021 - 2¹¹ = 276645545539973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (276645545542061) 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, 112549040896 + ... + 112549043353.

It is an arithmetic number, because the mean of its divisors is an integer number (69217660906875).

Almost surely, 2^{276645545542021} is an apocalyptic number.

It is an amenable number.

276645545542021 is a deficient number, since it is larger than the sum of its proper divisors (225098085479).

276645545542021 is a wasteful number, since it uses less digits than its factorization.

276645545542021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225098085478.

The product of its (nonzero) digits is 80640000, while the sum is 58.

The spelling of 276645545542021 in words is "two hundred seventy-six trillion, six hundred forty-five billion, five hundred forty-five million, five hundred forty-two thousand, twenty-one".