8277242551821 has 6 divisors (see below), whose sum is σ = 11956017019310. Its totient is φ = 5518161701208.

The previous prime is 8277242551807. The next prime is 8277242551829. The reversal of 8277242551821 is 1281552427728.

It is a happy number.

8277242551821 is a `hidden beast` number, since 8 + 2 + 7 + 7 + 2 + 4 + 2 + 551 + 82 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6495418029321 + 1781824522500 = 2548611^2 + 1334850^2 .

It is not a de Polignac number, because 8277242551821 - 2²² = 8277238357517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8277242551829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 459846808426 + ... + 459846808443.

Almost surely, 2^{8277242551821} is an apocalyptic number.

It is an amenable number.

8277242551821 is a deficient number, since it is larger than the sum of its proper divisors (3678774467489).

8277242551821 is a wasteful number, since it uses less digits than its factorization.

8277242551821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919693616875 (or 919693616872 counting only the distinct ones).

The product of its digits is 5017600, while the sum is 54.

The spelling of 8277242551821 in words is "eight trillion, two hundred seventy-seven billion, two hundred forty-two million, five hundred fifty-one thousand, eight hundred twenty-one".