66621614 has 4 divisors (see below), whose sum is σ = 99932424. Its totient is φ = 33310806.

The previous prime is 66621587. The next prime is 66621617. The reversal of 66621614 is 41612666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66621617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16655402 + ... + 16655405.

It is an arithmetic number, because the mean of its divisors is an integer number (24983106).

Almost surely, 2^66621614 is an apocalyptic number.

66621614 is a deficient number, since it is larger than the sum of its proper divisors (33310810).

66621614 is a wasteful number, since it uses less digits than its factorization.

66621614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33310809.

The product of its digits is 10368, while the sum is 32.

The square root of 66621614 is about 8162.2064418881. The cubic root of 66621614 is about 405.3887726486.

The spelling of 66621614 in words is "sixty-six million, six hundred twenty-one thousand, six hundred fourteen".