645302342404 has 12 divisors (see below), whose sum is σ = 1129402433628. Its totient is φ = 322615932800.

The previous prime is 645302342357. The next prime is 645302342407. The reversal of 645302342404 is 404243203546.

It can be written as a sum of positive squares in 2 ways, for example, as 459618914304 + 185683428100 = 677952^2 + 430910^2 .

It is a super-2 number, since 2×645302342404² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645302342407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8768377 + ... + 8841664.

It is an arithmetic number, because the mean of its divisors is an integer number (94116869469).

Almost surely, 2^645302342404 is an apocalyptic number.

It is an amenable number.

645302342404 is a deficient number, since it is larger than the sum of its proper divisors (484100091224).

645302342404 is a wasteful number, since it uses less digits than its factorization.

645302342404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17619206 (or 17619204 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 37.

The spelling of 645302342404 in words is "six hundred forty-five billion, three hundred two million, three hundred forty-two thousand, four hundred four".