645214450997 has 16 divisors (see below), whose sum is σ = 679690598400. Its totient is φ = 611720968320.

The previous prime is 645214450981. The next prime is 645214450999. The reversal of 645214450997 is 799054412546.

It is a cyclic number.

It is not a de Polignac number, because 645214450997 - 2⁴ = 645214450981 is a prime.

It is a super-2 number, since 2×645214450997² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645214450999) 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, 772013 + ... + 1373474.

It is an arithmetic number, because the mean of its divisors is an integer number (42480662400).

Almost surely, 2^645214450997 is an apocalyptic number.

It is an amenable number.

645214450997 is a deficient number, since it is larger than the sum of its proper divisors (34476147403).

645214450997 is a wasteful number, since it uses less digits than its factorization.

645214450997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145716.

The product of its (nonzero) digits is 10886400, while the sum is 56.

The spelling of 645214450997 in words is "six hundred forty-five billion, two hundred fourteen million, four hundred fifty thousand, nine hundred ninety-seven".