66637153220 has 96 divisors (see below), whose sum is σ = 157511088000. Its totient is φ = 23470156800.

The previous prime is 66637153211. The next prime is 66637153249. The reversal of 66637153220 is 2235173666.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1227206 + ... + 1280354.

It is an arithmetic number, because the mean of its divisors is an integer number (1640740500).

Almost surely, 2^66637153220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66637153220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78755544000).

66637153220 is an abundant number, since it is smaller than the sum of its proper divisors (90873934780).

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

66637153220 is a wasteful number, since it uses less digits than its factorization.

66637153220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53349 (or 53347 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 41.

The spelling of 66637153220 in words is "sixty-six billion, six hundred thirty-seven million, one hundred fifty-three thousand, two hundred twenty".