645246413561 has 8 divisors (see below), whose sum is σ = 652062725184. Its totient is φ = 638440713360.

The previous prime is 645246413557. The next prime is 645246413639. The reversal of 645246413561 is 165314642546.

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 645246413561 - 2² = 645246413557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645246413551) 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, 2530571 + ... + 2773856.

It is an arithmetic number, because the mean of its divisors is an integer number (81507840648).

Almost surely, 2^645246413561 is an apocalyptic number.

It is an amenable number.

645246413561 is a deficient number, since it is larger than the sum of its proper divisors (6816311623).

645246413561 is a wasteful number, since it uses less digits than its factorization.

645246413561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305711.

The product of its digits is 2073600, while the sum is 47.

The spelling of 645246413561 in words is "six hundred forty-five billion, two hundred forty-six million, four hundred thirteen thousand, five hundred sixty-one".