658321664 has 216 divisors, whose sum is σ = 1800747648. Its totient is φ = 236113920.

The previous prime is 658321661. The next prime is 658321681. The reversal of 658321664 is 466123856.

It is not an unprimeable number, because it can be changed into a prime (658321661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1793609 + ... + 1793975.

Almost surely, 2^658321664 is an apocalyptic number.

658321664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 658321664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (900373824).

658321664 is an abundant number, since it is smaller than the sum of its proper divisors (1142425984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

658321664 is a wasteful number, since it uses less digits than its factorization.

658321664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 400 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 658321664 is about 25657.7797948303. The cubic root of 658321664 is about 869.9201335942.

The spelling of 658321664 in words is "six hundred fifty-eight million, three hundred twenty-one thousand, six hundred sixty-four".