2643278726875 has 20 divisors (see below), whose sum is σ = 3307877709048. Its totient is φ = 2111526560000.

The previous prime is 2643278726819. The next prime is 2643278726923. The reversal of 2643278726875 is 5786278723462.

It is a happy number.

It is not a de Polignac number, because 2643278726875 - 2⁷ = 2643278726747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2643278726875.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2669206 + ... + 3522955.

Almost surely, 2^{2643278726875} is an apocalyptic number.

2643278726875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2643278726875 is a deficient number, since it is larger than the sum of its proper divisors (664598982173).

2643278726875 is an frugal number, since it uses more digits than its factorization.

2643278726875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6192864 (or 6192849 counting only the distinct ones).

The product of its digits is 379330560, while the sum is 67.

The spelling of 2643278726875 in words is "two trillion, six hundred forty-three billion, two hundred seventy-eight million, seven hundred twenty-six thousand, eight hundred seventy-five".