2540017771787 has 8 divisors (see below), whose sum is σ = 2542562695680. Its totient is φ = 2537473288680.

The previous prime is 2540017771763. The next prime is 2540017771801. The reversal of 2540017771787 is 7871777100452.

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 2540017771787 - 2⁶ = 2540017771723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540017771727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12093962 + ... + 12302192.

It is an arithmetic number, because the mean of its divisors is an integer number (317820336960).

Almost surely, 2^{2540017771787} is an apocalyptic number.

2540017771787 is a deficient number, since it is larger than the sum of its proper divisors (2544923893).

2540017771787 is a wasteful number, since it uses less digits than its factorization.

2540017771787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220393.

The product of its (nonzero) digits is 5378240, while the sum is 56.

The spelling of 2540017771787 in words is "two trillion, five hundred forty billion, seventeen million, seven hundred seventy-one thousand, seven hundred eighty-seven".