645531282953 has 8 divisors (see below), whose sum is σ = 683611278120. Its totient is φ = 607463239680.

The previous prime is 645531282899. The next prime is 645531282961. The reversal of 645531282953 is 359282135546.

It can be written as a sum of positive squares in 4 ways, for example, as 53734948864 + 591796334089 = 231808^2 + 769283^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645531282953 - 2¹⁶ = 645531217417 is a prime.

It is a super-2 number, since 2×645531282953² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645531282895 and 645531282904.

It is not an unprimeable number, because it can be changed into a prime (645531282853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2876648 + ... + 3092921.

It is an arithmetic number, because the mean of its divisors is an integer number (85451409765).

Almost surely, 2^645531282953 is an apocalyptic number.

It is an amenable number.

645531282953 is a deficient number, since it is larger than the sum of its proper divisors (38079995167).

645531282953 is a wasteful number, since it uses less digits than its factorization.

645531282953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5975947.

The product of its digits is 7776000, while the sum is 53.

The spelling of 645531282953 in words is "six hundred forty-five billion, five hundred thirty-one million, two hundred eighty-two thousand, nine hundred fifty-three".