66591970980 has 48 divisors (see below), whose sum is σ = 187394524800. Its totient is φ = 17668620288.

The previous prime is 66591970961. The next prime is 66591970981. The reversal of 66591970980 is 8907919566.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (66591970981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2776669 + ... + 2800548.

It is an arithmetic number, because the mean of its divisors is an integer number (3904052600).

Almost surely, 2^66591970980 is an apocalyptic number.

66591970980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66591970980 is an abundant number, since it is smaller than the sum of its proper divisors (120802553820).

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

66591970980 is a wasteful number, since it uses less digits than its factorization.

66591970980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5577428 (or 5577426 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 60.

The spelling of 66591970980 in words is "sixty-six billion, five hundred ninety-one million, nine hundred seventy thousand, nine hundred eighty".