645442464045 has 8 divisors (see below), whose sum is σ = 1032707942496. Its totient is φ = 344235980816.

The previous prime is 645442464041. The next prime is 645442464049. The reversal of 645442464045 is 540464244546.

It is an interprime number because it is at equal distance from previous prime (645442464041) and next prime (645442464049).

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 645442464045 - 2² = 645442464041 is a prime.

It is a super-2 number, since 2×645442464045² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645442463985 and 645442464003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645442464041) 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, 21514748787 + ... + 21514748816.

It is an arithmetic number, because the mean of its divisors is an integer number (129088492812).

Almost surely, 2^645442464045 is an apocalyptic number.

It is an amenable number.

645442464045 is a deficient number, since it is larger than the sum of its proper divisors (387265478451).

645442464045 is a wasteful number, since it uses less digits than its factorization.

645442464045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43029497611.

The product of its (nonzero) digits is 7372800, while the sum is 48.

The spelling of 645442464045 in words is "six hundred forty-five billion, four hundred forty-two million, four hundred sixty-four thousand, forty-five".