646923423541 has 32 divisors (see below), whose sum is σ = 690178186880. Its totient is φ = 604661760000.

The previous prime is 646923423499. The next prime is 646923423547. The reversal of 646923423541 is 145324329646.

It is a 10-Lehmer number, since φ(646923423541) divides (646923423541-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 646923423541 - 2¹⁷ = 646923292469 is a prime.

It is the 804316-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646923423547) by changing a digit.

It is a nontrivial repunit in base 804315.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287392666 + ... + 287394916.

It is an arithmetic number, because the mean of its divisors is an integer number (21568068340).

Almost surely, 2^646923423541 is an apocalyptic number.

It is an amenable number.

646923423541 is a deficient number, since it is larger than the sum of its proper divisors (43254763339).

646923423541 is a wasteful number, since it uses less digits than its factorization.

646923423541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077.

The product of its digits is 3732480, while the sum is 49.

The spelling of 646923423541 in words is "six hundred forty-six billion, nine hundred twenty-three million, four hundred twenty-three thousand, five hundred forty-one".