66018554662320 has 1800 divisors, whose sum is σ = 262869715042704. Its totient is φ = 15345704005632.

The previous prime is 66018554662301. The next prime is 66018554662339. The reversal of 66018554662320 is 2326645581066.

66018554662320 is a `hidden beast` number, since 6 + 6 + 0 + 1 + 8 + 5 + 5 + 4 + 6 + 623 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (66018554662301) and next prime (66018554662339).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 48083433154 + ... + 48083434526.

Almost surely, 2^{66018554662320} is an apocalyptic number.

66018554662320 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 66018554662320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131434857521352).

66018554662320 is an abundant number, since it is smaller than the sum of its proper divisors (196851160380384).

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

66018554662320 is a wasteful number, since it uses less digits than its factorization.

66018554662320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553 (or 1502 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 54.

The spelling of 66018554662320 in words is "sixty-six trillion, eighteen billion, five hundred fifty-four million, six hundred sixty-two thousand, three hundred twenty".