2540664783886 has 4 divisors (see below), whose sum is σ = 3810997175832. Its totient is φ = 1270332391942.

The previous prime is 2540664783871. The next prime is 2540664783887. The reversal of 2540664783886 is 6883874660452.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540664783887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635166195970 + ... + 635166195973.

It is an arithmetic number, because the mean of its divisors is an integer number (952749293958).

Almost surely, 2^{2540664783886} is an apocalyptic number.

2540664783886 is a deficient number, since it is larger than the sum of its proper divisors (1270332391946).

2540664783886 is a wasteful number, since it uses less digits than its factorization.

2540664783886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270332391945.

The product of its (nonzero) digits is 371589120, while the sum is 67.

The spelling of 2540664783886 in words is "two trillion, five hundred forty billion, six hundred sixty-four million, seven hundred eighty-three thousand, eight hundred eighty-six".