643624026654161 has 8 divisors (see below), whose sum is σ = 742079788001664. Its totient is φ = 546795633263040.

The previous prime is 643624026654043. The next prime is 643624026654181. The reversal of 643624026654161 is 161456620426346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643624026654161 - 2³⁰ = 643622952912337 is a prime.

It is a super-2 number, since 2×643624026654161² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643624026654097 and 643624026654106.

It is not an unprimeable number, because it can be changed into a prime (643624026654181) 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, 406841988245 + ... + 406841989826.

It is an arithmetic number, because the mean of its divisors is an integer number (92759973500208).

Almost surely, 2^{643624026654161} is an apocalyptic number.

It is an amenable number.

643624026654161 is a deficient number, since it is larger than the sum of its proper divisors (98455761347503).

643624026654161 is a wasteful number, since it uses less digits than its factorization.

643624026654161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813683978191.

The product of its (nonzero) digits is 29859840, while the sum is 56.

The spelling of 643624026654161 in words is "six hundred forty-three trillion, six hundred twenty-four billion, twenty-six million, six hundred fifty-four thousand, one hundred sixty-one".