645426145 has 32 divisors (see below), whose sum is σ = 956051712. Its totient is φ = 407331072.

The previous prime is 645426091. The next prime is 645426203. The reversal of 645426145 is 541624546.

It is a cyclic number.

It is not a de Polignac number, because 645426145 - 2⁹ = 645425633 is a prime.

It is a super-2 number, since 2×645426145² = 833149817299122050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167814 + ... + 171616.

It is an arithmetic number, because the mean of its divisors is an integer number (29876616).

Almost surely, 2^645426145 is an apocalyptic number.

645426145 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

645426145 is a deficient number, since it is larger than the sum of its proper divisors (310625567).

645426145 is a wasteful number, since it uses less digits than its factorization.

645426145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4201.

The product of its digits is 115200, while the sum is 37.

The square root of 645426145 is about 25405.2385346015. The cubic root of 645426145 is about 864.2024992785.

The spelling of 645426145 in words is "six hundred forty-five million, four hundred twenty-six thousand, one hundred forty-five".