66653982 has 16 divisors (see below), whose sum is σ = 148120080. Its totient is φ = 22217976.

The previous prime is 66653971. The next prime is 66654001. The reversal of 66653982 is 28935666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 617113 + ... + 617220.

It is an arithmetic number, because the mean of its divisors is an integer number (9257505).

Almost surely, 2^66653982 is an apocalyptic number.

66653982 is an abundant number, since it is smaller than the sum of its proper divisors (81466098).

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

66653982 is a wasteful number, since it uses less digits than its factorization.

66653982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234344 (or 1234338 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 66653982 is about 8164.1889983023. The cubic root of 66653982 is about 405.4544145054.

The spelling of 66653982 in words is "sixty-six million, six hundred fifty-three thousand, nine hundred eighty-two".