66624257700 has 1512 divisors, whose sum is σ = 296776046784. Its totient is φ = 12625113600.

The previous prime is 66624257683. The next prime is 66624257723. The reversal of 66624257700 is 775242666.

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 503 ways as a sum of consecutive naturals, for example, 802701859 + ... + 802701941.

Almost surely, 2^66624257700 is an apocalyptic number.

66624257700 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 66624257700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148388023392).

66624257700 is an abundant number, since it is smaller than the sum of its proper divisors (230151789084).

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

66624257700 is a wasteful number, since it uses less digits than its factorization.

66624257700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The spelling of 66624257700 in words is "sixty-six billion, six hundred twenty-four million, two hundred fifty-seven thousand, seven hundred".