66188621952 has 96 divisors (see below), whose sum is σ = 193147493760. Its totient is φ = 21752102400.

The previous prime is 66188621951. The next prime is 66188621957. The reversal of 66188621952 is 25912688166.

66188621952 is a `hidden beast` number, since 6 + 6 + 1 + 8 + 8 + 621 + 9 + 5 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (66188621951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 322824 + ... + 486407.

It is an arithmetic number, because the mean of its divisors is an integer number (2011953060).

Almost surely, 2^66188621952 is an apocalyptic number.

It is an amenable number.

66188621952 is an abundant number, since it is smaller than the sum of its proper divisors (126958871808).

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

66188621952 is a wasteful number, since it uses less digits than its factorization.

66188621952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809322 (or 809307 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The spelling of 66188621952 in words is "sixty-six billion, one hundred eighty-eight million, six hundred twenty-one thousand, nine hundred fifty-two".