666536099460 has 1152 divisors, whose sum is σ = 2578404648960. Its totient is φ = 126804787200.

The previous prime is 666536099447. The next prime is 666536099497. The reversal of 666536099460 is 64990635666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 666536099394 and 666536099403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 3158938755 + ... + 3158938965.

It is an arithmetic number, because the mean of its divisors is an integer number (2238198480).

Almost surely, 2^666536099460 is an apocalyptic number.

666536099460 is a gapful number since it is divisible by the number (60) 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 666536099460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1289202324480).

666536099460 is an abundant number, since it is smaller than the sum of its proper divisors (1911868549500).

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

666536099460 is a wasteful number, since it uses less digits than its factorization.

666536099460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 37791360, while the sum is 60.

The spelling of 666536099460 in words is "six hundred sixty-six billion, five hundred thirty-six million, ninety-nine thousand, four hundred sixty".