66896621 has 8 divisors (see below), whose sum is σ = 73250688. Its totient is φ = 60588000.

The previous prime is 66896617. The next prime is 66896623. The reversal of 66896621 is 12669866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66896621 - 2² = 66896617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66896623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8240 + ... + 14201.

It is an arithmetic number, because the mean of its divisors is an integer number (9156336).

Almost surely, 2^66896621 is an apocalyptic number.

It is an amenable number.

66896621 is a deficient number, since it is larger than the sum of its proper divisors (6354067).

66896621 is a wasteful number, since it uses less digits than its factorization.

66896621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22723.

The product of its digits is 186624, while the sum is 44.

The square root of 66896621 is about 8179.0354565804. The cubic root of 66896621 is about 405.9458075969.

The spelling of 66896621 in words is "sixty-six million, eight hundred ninety-six thousand, six hundred twenty-one".