645272127626 has 64 divisors (see below), whose sum is σ = 1190246545152. Its totient is φ = 256066348032.

The previous prime is 645272127611. The next prime is 645272127649. The reversal of 645272127626 is 626721272546.

It is a super-2 number, since 2×645272127626² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12683576 + ... + 12734348.

It is an arithmetic number, because the mean of its divisors is an integer number (18597602268).

Almost surely, 2^645272127626 is an apocalyptic number.

645272127626 is a deficient number, since it is larger than the sum of its proper divisors (544974417526).

645272127626 is a wasteful number, since it uses less digits than its factorization.

645272127626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51663.

The product of its digits is 3386880, while the sum is 50.

The spelling of 645272127626 in words is "six hundred forty-five billion, two hundred seventy-two million, one hundred twenty-seven thousand, six hundred twenty-six".