2546643561 has 64 divisors (see below), whose sum is σ = 4300646400. Its totient is φ = 1312956480.

The previous prime is 2546643553. The next prime is 2546643563. The reversal of 2546643561 is 1653466452.

It is not a de Polignac number, because 2546643561 - 2³ = 2546643553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2546643563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5002975 + ... + 5003483.

It is an arithmetic number, because the mean of its divisors is an integer number (67197600).

Almost surely, 2^2546643561 is an apocalyptic number.

2546643561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2546643561 is a deficient number, since it is larger than the sum of its proper divisors (1754002839).

2546643561 is a wasteful number, since it uses less digits than its factorization.

2546643561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731 (or 709 counting only the distinct ones).

The product of its digits is 518400, while the sum is 42.

The square root of 2546643561 is about 50464.2800503485. The cubic root of 2546643561 is about 1365.5975255665.

The spelling of 2546643561 in words is "two billion, five hundred forty-six million, six hundred forty-three thousand, five hundred sixty-one".