66121382 has 4 divisors (see below), whose sum is σ = 99182076. Its totient is φ = 33060690.

The previous prime is 66121373. The next prime is 66121403. The reversal of 66121382 is 28312166.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16530344 + ... + 16530347.

It is an arithmetic number, because the mean of its divisors is an integer number (24795519).

Almost surely, 2^66121382 is an apocalyptic number.

66121382 is a deficient number, since it is larger than the sum of its proper divisors (33060694).

66121382 is a wasteful number, since it uses less digits than its factorization.

66121382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33060693.

The product of its digits is 3456, while the sum is 29.

The square root of 66121382 is about 8131.5055186601. The cubic root of 66121382 is about 404.3715946814.

The spelling of 66121382 in words is "sixty-six million, one hundred twenty-one thousand, three hundred eighty-two".