645374401 has 16 divisors (see below), whose sum is σ = 755780608. Its totient is φ = 539557200.

The previous prime is 645374377. The next prime is 645374419. The reversal of 645374401 is 104473546.

645374401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645374401 - 2²³ = 636985793 is a prime.

It is a super-2 number, since 2×645374401² = 833016234932217602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645374491) 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, 351556 + ... + 353386.

It is an arithmetic number, because the mean of its divisors is an integer number (47236288).

Almost surely, 2^645374401 is an apocalyptic number.

It is an amenable number.

645374401 is a deficient number, since it is larger than the sum of its proper divisors (110406207).

645374401 is a wasteful number, since it uses less digits than its factorization.

645374401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 645374401 is about 25404.2201415434. The cubic root of 645374401 is about 864.1794042069.

The spelling of 645374401 in words is "six hundred forty-five million, three hundred seventy-four thousand, four hundred one".