6543554116261 has 4 divisors (see below), whose sum is σ = 6720406930252. Its totient is φ = 6366701302272.

The previous prime is 6543554116259. The next prime is 6543554116291. The reversal of 6543554116261 is 1626114553456.

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 2623573865025 + 3919980251236 = 1619745^2 + 1979894^2 .

It is a cyclic number.

It is not a de Polignac number, because 6543554116261 - 2¹ = 6543554116259 is a prime.

It is a super-3 number, since 3×6543554116261³ (a number of 39 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543554116241) 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, 88426406940 + ... + 88426407013.

It is an arithmetic number, because the mean of its divisors is an integer number (1680101732563).

Almost surely, 2^{6543554116261} is an apocalyptic number.

It is an amenable number.

6543554116261 is a deficient number, since it is larger than the sum of its proper divisors (176852813991).

6543554116261 is a wasteful number, since it uses less digits than its factorization.

6543554116261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176852813990.

The product of its digits is 2592000, while the sum is 49.

The spelling of 6543554116261 in words is "six trillion, five hundred forty-three billion, five hundred fifty-four million, one hundred sixteen thousand, two hundred sixty-one".