66655351 has 16 divisors (see below), whose sum is σ = 81774144. Its totient is φ = 53028864.

The previous prime is 66655339. The next prime is 66655387. The reversal of 66655351 is 15355666.

It is a happy number.

It is not a de Polignac number, because 66655351 - 2⁵ = 66655319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66655351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66655321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4851 + ... + 12523.

It is an arithmetic number, because the mean of its divisors is an integer number (5110884).

Almost surely, 2^66655351 is an apocalyptic number.

66655351 is a deficient number, since it is larger than the sum of its proper divisors (15118793).

66655351 is a wasteful number, since it uses less digits than its factorization.

66655351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7770.

The product of its digits is 81000, while the sum is 37.

The square root of 66655351 is about 8164.2728396349. The cubic root of 66655351 is about 405.4571903500.

The spelling of 66655351 in words is "sixty-six million, six hundred fifty-five thousand, three hundred fifty-one".