643463253545 has 16 divisors (see below), whose sum is σ = 886251300480. Its totient is φ = 439338240384.

The previous prime is 643463253539. The next prime is 643463253583. The reversal of 643463253545 is 545352364346.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 643463253545 - 2⁶ = 643463253481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643463253493 and 643463253502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39443915 + ... + 39460224.

It is an arithmetic number, because the mean of its divisors is an integer number (55390706280).

Almost surely, 2^643463253545 is an apocalyptic number.

It is an amenable number.

643463253545 is a deficient number, since it is larger than the sum of its proper divisors (242788046935).

643463253545 is a wasteful number, since it uses less digits than its factorization.

643463253545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78904384.

The product of its digits is 15552000, while the sum is 50.

The spelling of 643463253545 in words is "six hundred forty-three billion, four hundred sixty-three million, two hundred fifty-three thousand, five hundred forty-five".