643601316162451 has 8 divisors (see below), whose sum is σ = 666299001754944. Its totient is φ = 621278798927040.

The previous prime is 643601316162419. The next prime is 643601316162479. The reversal of 643601316162451 is 154261613106346.

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 643601316162451 - 2⁵ = 643601316162419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643601316162395 and 643601316162404.

It is not an unprimeable number, because it can be changed into a prime (643601316168451) 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, 93792085780 + ... + 93792092641.

It is an arithmetic number, because the mean of its divisors is an integer number (83287375219368).

Almost surely, 2^{643601316162451} is an apocalyptic number.

643601316162451 is a deficient number, since it is larger than the sum of its proper divisors (22697685592493).

643601316162451 is a wasteful number, since it uses less digits than its factorization.

643601316162451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187584178541.

The product of its (nonzero) digits is 1866240, while the sum is 49.

Adding to 643601316162451 its reverse (154261613106346), we get a palindrome (797862929268797).

The spelling of 643601316162451 in words is "six hundred forty-three trillion, six hundred one billion, three hundred sixteen million, one hundred sixty-two thousand, four hundred fifty-one".