66653233920 has 1296 divisors, whose sum is σ = 299237283072. Its totient is φ = 13563002880.

The previous prime is 66653233919. The next prime is 66653233979. The reversal of 66653233920 is 2933235666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 227485294 + ... + 227485586.

Almost surely, 2^66653233920 is an apocalyptic number.

66653233920 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 66653233920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149618641536).

66653233920 is an abundant number, since it is smaller than the sum of its proper divisors (232584049152).

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

66653233920 is a wasteful number, since it uses less digits than its factorization.

66653233920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 45.

The spelling of 66653233920 in words is "sixty-six billion, six hundred fifty-three million, two hundred thirty-three thousand, nine hundred twenty".