645580659967 has 4 divisors (see below), whose sum is σ = 650292927696. Its totient is φ = 640868392240.

The previous prime is 645580659961. The next prime is 645580659973. The reversal of 645580659967 is 769956085546.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (645580659961) and next prime (645580659973).

It is a cyclic number.

It is not a de Polignac number, because 645580659967 - 2³¹ = 643433176319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645580659896 and 645580659905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645580659961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2356133659 + ... + 2356133932.

It is an arithmetic number, because the mean of its divisors is an integer number (162573231924).

Almost surely, 2^645580659967 is an apocalyptic number.

645580659967 is a deficient number, since it is larger than the sum of its proper divisors (4712267729).

645580659967 is a wasteful number, since it uses less digits than its factorization.

645580659967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712267728.

The product of its (nonzero) digits is 489888000, while the sum is 70.

The spelling of 645580659967 in words is "six hundred forty-five billion, five hundred eighty million, six hundred fifty-nine thousand, nine hundred sixty-seven".