2546638681 has 8 divisors (see below), whose sum is σ = 2555280000. Its totient is φ = 2538008880.

The previous prime is 2546638673. The next prime is 2546638727. The reversal of 2546638681 is 1868366452.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2546638681 - 2³ = 2546638673 is a prime.

It is a super-2 number, since 2×2546638681² = 12970737143130839522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2546638631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726070 + ... + 729568.

It is an arithmetic number, because the mean of its divisors is an integer number (319410000).

Almost surely, 2^2546638681 is an apocalyptic number.

It is an amenable number.

2546638681 is a deficient number, since it is larger than the sum of its proper divisors (8641319).

2546638681 is a wasteful number, since it uses less digits than its factorization.

2546638681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5759.

The product of its digits is 1658880, while the sum is 49.

The square root of 2546638681 is about 50464.2316992937. The cubic root of 2546638681 is about 1365.5966532916.

The spelling of 2546638681 in words is "two billion, five hundred forty-six million, six hundred thirty-eight thousand, six hundred eighty-one".