2541640643 has 4 divisors (see below), whose sum is σ = 2541757488. Its totient is φ = 2541523800.

The previous prime is 2541640639. The next prime is 2541640681. The reversal of 2541640643 is 3460461452.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2541640643 - 2² = 2541640639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2541640043) 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, 15071 + ... + 72872.

It is an arithmetic number, because the mean of its divisors is an integer number (635439372).

Almost surely, 2^2541640643 is an apocalyptic number.

2541640643 is a deficient number, since it is larger than the sum of its proper divisors (116845).

2541640643 is an equidigital number, since it uses as much as digits as its factorization.

2541640643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116844.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 2541640643 is about 50414.6867787553. The cubic root of 2541640643 is about 1364.7026939966.

The spelling of 2541640643 in words is "two billion, five hundred forty-one million, six hundred forty thousand, six hundred forty-three".