643465005001 has 16 divisors (see below), whose sum is σ = 792031945600. Its totient is φ = 509066944128.

The previous prime is 643465004983. The next prime is 643465005059. The reversal of 643465005001 is 100500564346.

It is a cyclic number.

It is not a de Polignac number, because 643465005001 - 2⁷ = 643465004873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643465005061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 646810 + ... + 1305868.

It is an arithmetic number, because the mean of its divisors is an integer number (49501996600).

Almost surely, 2^643465005001 is an apocalyptic number.

It is an amenable number.

643465005001 is a deficient number, since it is larger than the sum of its proper divisors (148566940599).

643465005001 is a wasteful number, since it uses less digits than its factorization.

643465005001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669808.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 643465005001 its reverse (100500564346), we get a palindrome (743965569347).

The spelling of 643465005001 in words is "six hundred forty-three billion, four hundred sixty-five million, five thousand, one".