645453341 has 8 divisors (see below), whose sum is σ = 695382744. Its totient is φ = 595563840.

The previous prime is 645453337. The next prime is 645453343. The reversal of 645453341 is 143354546.

It can be written as a sum of positive squares in 4 ways, for example, as 383337241 + 262116100 = 19579^2 + 16190^2 .

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 645453341 - 2² = 645453337 is a prime.

It is a super-2 number, since 2×645453341² = 833220030816124562, which 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 (645453343) 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, 29411 + ... + 46431.

It is an arithmetic number, because the mean of its divisors is an integer number (86922843).

Almost surely, 2^645453341 is an apocalyptic number.

It is an amenable number.

645453341 is a deficient number, since it is larger than the sum of its proper divisors (49929403).

645453341 is a wasteful number, since it uses less digits than its factorization.

645453341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19951.

The product of its digits is 86400, while the sum is 35.

The square root of 645453341 is about 25405.7737729045. The cubic root of 645453341 is about 864.2146372648.

It can be divided in two parts, 6454 and 53341, that added together give a palindrome (59795).

The spelling of 645453341 in words is "six hundred forty-five million, four hundred fifty-three thousand, three hundred forty-one".