645116024554 has 4 divisors (see below), whose sum is σ = 967674036834. Its totient is φ = 322558012276.

The previous prime is 645116024549. The next prime is 645116024557. The reversal of 645116024554 is 455420611546.

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

It can be written as a sum of positive squares in only one way, i.e., 467602954225 + 177513070329 = 683815^2 + 421323^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 645116024554.

It is not an unprimeable number, because it can be changed into a prime (645116024557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161279006137 + ... + 161279006140.

Almost surely, 2^645116024554 is an apocalyptic number.

645116024554 is a deficient number, since it is larger than the sum of its proper divisors (322558012280).

645116024554 is a wasteful number, since it uses less digits than its factorization.

645116024554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322558012279.

The product of its (nonzero) digits is 576000, while the sum is 43.

The spelling of 645116024554 in words is "six hundred forty-five billion, one hundred sixteen million, twenty-four thousand, five hundred fifty-four".