643123614266405 has 16 divisors (see below), whose sum is σ = 771993780929280. Its totient is φ = 514335282084288.

The previous prime is 643123614266303. The next prime is 643123614266423. The reversal of 643123614266405 is 504662416321346.

It is a cyclic number.

It is not a de Polignac number, because 643123614266405 - 2⁸ = 643123614266149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259335764 + ... + 261803906.

It is an arithmetic number, because the mean of its divisors is an integer number (48249611308080).

Almost surely, 2^{643123614266405} is an apocalyptic number.

It is an amenable number.

643123614266405 is a deficient number, since it is larger than the sum of its proper divisors (128870166662875).

643123614266405 is a wasteful number, since it uses less digits than its factorization.

643123614266405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484700.

The product of its (nonzero) digits is 14929920, while the sum is 53.

The spelling of 643123614266405 in words is "six hundred forty-three trillion, one hundred twenty-three billion, six hundred fourteen million, two hundred sixty-six thousand, four hundred five".