645611244541 has 8 divisors (see below), whose sum is σ = 651343809600. Its totient is φ = 639890865120.

The previous prime is 645611244533. The next prime is 645611244557. The reversal of 645611244541 is 145442116546.

It is a happy number.

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 645611244541 - 2³ = 645611244533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645611244511) 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, 2939961 + ... + 3151918.

It is an arithmetic number, because the mean of its divisors is an integer number (81417976200).

Almost surely, 2^645611244541 is an apocalyptic number.

It is an amenable number.

645611244541 is a deficient number, since it is larger than the sum of its proper divisors (5732565059).

645611244541 is a wasteful number, since it uses less digits than its factorization.

645611244541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6092819.

The product of its digits is 460800, while the sum is 43.

The spelling of 645611244541 in words is "six hundred forty-five billion, six hundred eleven million, two hundred forty-four thousand, five hundred forty-one".