66053621 has 8 divisors (see below), whose sum is σ = 67998720. Its totient is φ = 64117008.

The previous prime is 66053593. The next prime is 66053629. The reversal of 66053621 is 12635066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66053621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66053629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15860 + ... + 19586.

It is an arithmetic number, because the mean of its divisors is an integer number (8499840).

Almost surely, 2^66053621 is an apocalyptic number.

It is an amenable number.

66053621 is a deficient number, since it is larger than the sum of its proper divisors (1945099).

66053621 is a wasteful number, since it uses less digits than its factorization.

66053621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66053621 is about 8127.3378790352. The cubic root of 66053621 is about 404.2334145237.

Adding to 66053621 its reverse (12635066), we get a palindrome (78688687).

The spelling of 66053621 in words is "sixty-six million, fifty-three thousand, six hundred twenty-one".