6512400645 has 16 divisors (see below), whose sum is σ = 10453352832. Its totient is φ = 3462109760.

The previous prime is 6512400623. The next prime is 6512400667. The reversal of 6512400645 is 5460042156.

It is an interprime number because it is at equal distance from previous prime (6512400623) and next prime (6512400667).

It is not a de Polignac number, because 6512400645 - 2⁶ = 6512400581 is a prime.

It is a super-2 number, since 2×6512400645² = 84822724321992832050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 693342 + ... + 702671.

It is an arithmetic number, because the mean of its divisors is an integer number (653334552).

Almost surely, 2^6512400645 is an apocalyptic number.

It is an amenable number.

6512400645 is a deficient number, since it is larger than the sum of its proper divisors (3940952187).

6512400645 is a wasteful number, since it uses less digits than its factorization.

6512400645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396332.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 6512400645 is about 80699.4463735657. The cubic root of 6512400645 is about 1867.4416333466.

The spelling of 6512400645 in words is "six billion, five hundred twelve million, four hundred thousand, six hundred forty-five".