66525562320 has 160 divisors (see below), whose sum is σ = 237490513920. Its totient is φ = 15089717760.

The previous prime is 66525562309. The next prime is 66525562339. The reversal of 66525562320 is 2326552566.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68941 + ... + 371219.

It is an arithmetic number, because the mean of its divisors is an integer number (1484315712).

Almost surely, 2^66525562320 is an apocalyptic number.

66525562320 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 66525562320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118745256960).

66525562320 is an abundant number, since it is smaller than the sum of its proper divisors (170964951600).

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

66525562320 is a wasteful number, since it uses less digits than its factorization.

66525562320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302433 (or 302427 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 66525562320 in words is "sixty-six billion, five hundred twenty-five million, five hundred sixty-two thousand, three hundred twenty".