645012511 has 8 divisors (see below), whose sum is σ = 757777104. Its totient is φ = 541269120.

The previous prime is 645012503. The next prime is 645012517. The reversal of 645012511 is 115210546.

It is a happy number.

645012511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 645012511 - 2³ = 645012503 is a prime.

It is a super-2 number, since 2×645012511² = 832082278693050242, 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 (645012517) 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, 2255146 + ... + 2255431.

It is an arithmetic number, because the mean of its divisors is an integer number (94722138).

Almost surely, 2^645012511 is an apocalyptic number.

645012511 is a deficient number, since it is larger than the sum of its proper divisors (112764593).

645012511 is a wasteful number, since it uses less digits than its factorization.

645012511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510601.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 645012511 is about 25397.0965072781. The cubic root of 645012511 is about 864.0178461213.

The spelling of 645012511 in words is "six hundred forty-five million, twelve thousand, five hundred eleven".