2647856440509 has 12 divisors (see below), whose sum is σ = 4106879377344. Its totient is φ = 1513060823064.

The previous prime is 2647856440487. The next prime is 2647856440583. The reversal of 2647856440509 is 9050446587462.

It is a happy number.

It is not a de Polignac number, because 2647856440509 - 2⁷ = 2647856440381 is a prime.

It is a super-2 number, since 2×2647856440509² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2647856440109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9006314277 + ... + 9006314570.

It is an arithmetic number, because the mean of its divisors is an integer number (342239948112).

Almost surely, 2^{2647856440509} is an apocalyptic number.

It is an amenable number.

2647856440509 is a deficient number, since it is larger than the sum of its proper divisors (1459022936835).

2647856440509 is a wasteful number, since it uses less digits than its factorization.

2647856440509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18012628864 (or 18012628857 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 60.

The spelling of 2647856440509 in words is "two trillion, six hundred forty-seven billion, eight hundred fifty-six million, four hundred forty thousand, five hundred nine".