645254452546 has 48 divisors (see below), whose sum is σ = 1077513736320. Its totient is φ = 289552868000.

The previous prime is 645254452541. The next prime is 645254452657.

645254452546 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 645254452493 and 645254452502.

It is not an unprimeable number, because it can be changed into a prime (645254452541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8443335 + ... + 8519413.

It is an arithmetic number, because the mean of its divisors is an integer number (22448202840).

Almost surely, 2^645254452546 is an apocalyptic number.

645254452546 is a deficient number, since it is larger than the sum of its proper divisors (432259283774).

645254452546 is a wasteful number, since it uses less digits than its factorization.

645254452546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76551 (or 76540 counting only the distinct ones).

The product of its digits is 23040000, while the sum is 52.

The spelling of 645254452546 in words is "six hundred forty-five billion, two hundred fifty-four million, four hundred fifty-two thousand, five hundred forty-six".