664990545 has 16 divisors (see below), whose sum is σ = 1086624000. Its totient is φ = 347115264.

The previous prime is 664990541. The next prime is 664990567. The reversal of 664990545 is 545099466.

It is not a de Polignac number, because 664990545 - 2² = 664990541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664990494 and 664990503.

It is not an unprimeable number, because it can be changed into a prime (664990541) 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, 470920 + ... + 472329.

It is an arithmetic number, because the mean of its divisors is an integer number (67914000).

Almost surely, 2^664990545 is an apocalyptic number.

It is an amenable number.

664990545 is a deficient number, since it is larger than the sum of its proper divisors (421633455).

664990545 is a wasteful number, since it uses less digits than its factorization.

664990545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943304.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The square root of 664990545 is about 25787.4105912168. The cubic root of 664990545 is about 872.8477367499.

The spelling of 664990545 in words is "six hundred sixty-four million, nine hundred ninety thousand, five hundred forty-five".