2643405551 has 4 divisors (see below), whose sum is σ = 2643618600. Its totient is φ = 2643192504.

The previous prime is 2643405517. The next prime is 2643405563. The reversal of 2643405551 is 1555043462.

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

It is a cyclic number.

It is not a de Polignac number, because 2643405551 - 2²⁶ = 2576296687 is a prime.

It is a super-2 number, since 2×2643405551² = 13975185814115227202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643405151) 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, 86681 + ... + 113138.

It is an arithmetic number, because the mean of its divisors is an integer number (660904650).

Almost surely, 2^2643405551 is an apocalyptic number.

2643405551 is a deficient number, since it is larger than the sum of its proper divisors (213049).

2643405551 is a wasteful number, since it uses less digits than its factorization.

2643405551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213048.

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 2643405551 is about 51414.0598572025. The cubic root of 2643405551 is about 1382.6786784921.

The spelling of 2643405551 in words is "two billion, six hundred forty-three million, four hundred five thousand, five hundred fifty-one".