645524909697 has 16 divisors (see below), whose sum is σ = 893894209920. Its totient is φ = 414014147712.

The previous prime is 645524909669. The next prime is 645524909719. The reversal of 645524909697 is 796909425546.

It is not a de Polignac number, because 645524909697 - 2⁸ = 645524909441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645524409697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32661693 + ... + 32681450.

It is an arithmetic number, because the mean of its divisors is an integer number (55868388120).

Almost surely, 2^645524909697 is an apocalyptic number.

It is an amenable number.

645524909697 is a deficient number, since it is larger than the sum of its proper divisors (248369300223).

645524909697 is a wasteful number, since it uses less digits than its factorization.

645524909697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65343272.

The product of its (nonzero) digits is 146966400, while the sum is 66.

The spelling of 645524909697 in words is "six hundred forty-five billion, five hundred twenty-four million, nine hundred nine thousand, six hundred ninety-seven".