664624545 has 16 divisors (see below), whose sum is σ = 1145199552. Its totient is φ = 327199680.

The previous prime is 664624507. The next prime is 664624549. The reversal of 664624545 is 545426466.

It is not a de Polignac number, because 664624545 - 2⁶ = 664624481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664624497 and 664624506.

It is not an unprimeable number, because it can be changed into a prime (664624549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1703971 + ... + 1704360.

It is an arithmetic number, because the mean of its divisors is an integer number (71574972).

Almost surely, 2^664624545 is an apocalyptic number.

664624545 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

664624545 is a deficient number, since it is larger than the sum of its proper divisors (480575007).

664624545 is a wasteful number, since it uses less digits than its factorization.

664624545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3408352.

The product of its digits is 691200, while the sum is 42.

The square root of 664624545 is about 25780.3131284319. The cubic root of 664624545 is about 872.6875736213.

The spelling of 664624545 in words is "six hundred sixty-four million, six hundred twenty-four thousand, five hundred forty-five".