643376497523 has 8 divisors (see below), whose sum is σ = 644093086560. Its totient is φ = 642660016320.

The previous prime is 643376497513. The next prime is 643376497553. The reversal of 643376497523 is 325794673346.

643376497523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 643376497523 - 2¹² = 643376493427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643376497513) 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, 19815983 + ... + 19848423.

It is an arithmetic number, because the mean of its divisors is an integer number (80511635820).

Almost surely, 2^643376497523 is an apocalyptic number.

643376497523 is a deficient number, since it is larger than the sum of its proper divisors (716589037).

643376497523 is a wasteful number, since it uses less digits than its factorization.

643376497523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53917.

The product of its digits is 68584320, while the sum is 59.

The spelling of 643376497523 in words is "six hundred forty-three billion, three hundred seventy-six million, four hundred ninety-seven thousand, five hundred twenty-three".