643531610225555 has 8 divisors (see below), whose sum is σ = 772239566861952. Its totient is φ = 514824198452928.

The previous prime is 643531610225437. The next prime is 643531610225557. The reversal of 643531610225555 is 555522016135346.

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 643531610225555 - 2⁸ = 643531610225299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643531610225497 and 643531610225506.

It is not an unprimeable number, because it can be changed into a prime (643531610225557) 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, 133613027 + ... + 138345596.

It is an arithmetic number, because the mean of its divisors is an integer number (96529945857744).

Almost surely, 2^{643531610225555} is an apocalyptic number.

643531610225555 is a deficient number, since it is larger than the sum of its proper divisors (128707956636397).

643531610225555 is a wasteful number, since it uses less digits than its factorization.

643531610225555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272431885.

The product of its (nonzero) digits is 16200000, while the sum is 53.

The spelling of 643531610225555 in words is "six hundred forty-three trillion, five hundred thirty-one billion, six hundred ten million, two hundred twenty-five thousand, five hundred fifty-five".