645252640151 has 4 divisors (see below), whose sum is σ = 737431588752. Its totient is φ = 553073691552.

The previous prime is 645252640139. The next prime is 645252640171. The reversal of 645252640151 is 151046252546.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645252640151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645252640099 and 645252640108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645252640171) 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, 46089474290 + ... + 46089474303.

It is an arithmetic number, because the mean of its divisors is an integer number (184357897188).

Almost surely, 2^645252640151 is an apocalyptic number.

645252640151 is a deficient number, since it is larger than the sum of its proper divisors (92178948601).

645252640151 is an equidigital number, since it uses as much as digits as its factorization.

645252640151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92178948600.

The product of its (nonzero) digits is 288000, while the sum is 41.

Adding to 645252640151 its reverse (151046252546), we get a palindrome (796298892697).

The spelling of 645252640151 in words is "six hundred forty-five billion, two hundred fifty-two million, six hundred forty thousand, one hundred fifty-one".