645351113040 has 80 divisors (see below), whose sum is σ = 2065123585536. Its totient is φ = 166542220800.

The previous prime is 645351113027. The next prime is 645351113041. The reversal of 645351113040 is 40311153546.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 645351112992 and 645351113010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645351113041) 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, 43362931 + ... + 43377810.

Almost surely, 2^645351113040 is an apocalyptic number.

645351113040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645351113040 is an abundant number, since it is smaller than the sum of its proper divisors (1419772472496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645351113040 is a wasteful number, since it uses less digits than its factorization.

645351113040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86740788 (or 86740782 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 645351113040 its reverse (40311153546), we get a palindrome (685662266586).

The spelling of 645351113040 in words is "six hundred forty-five billion, three hundred fifty-one million, one hundred thirteen thousand, forty".