664418209455 has 648 divisors, whose sum is σ = 1673937673200. Its totient is φ = 240929095680.

The previous prime is 664418209453. The next prime is 664418209501. The reversal of 664418209455 is 554902814466.

It is a happy number.

664418209455 is a `hidden beast` number, since 6 + 6 + 4 + 4 + 182 + 0 + 9 + 455 = 666.

It is not a de Polignac number, because 664418209455 - 2¹ = 664418209453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664418209453) by changing a digit.

It is a polite number, since it can be written in 647 ways as a sum of consecutive naturals, for example, 1479773071 + ... + 1479773519.

It is an arithmetic number, because the mean of its divisors is an integer number (2583237150).

Almost surely, 2^664418209455 is an apocalyptic number.

664418209455 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

664418209455 is an abundant number, since it is smaller than the sum of its proper divisors (1009519463745).

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

664418209455 is a wasteful number, since it uses less digits than its factorization.

664418209455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 507 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 54.

The spelling of 664418209455 in words is "six hundred sixty-four billion, four hundred eighteen million, two hundred nine thousand, four hundred fifty-five".