66695655 has 32 divisors (see below), whose sum is σ = 115315200. Its totient is φ = 32722560.

The previous prime is 66695627. The next prime is 66695659. The reversal of 66695655 is 55659666.

It is not a de Polignac number, because 66695655 - 2⁸ = 66695399 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66695659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111046 + ... + 111644.

It is an arithmetic number, because the mean of its divisors is an integer number (3603600).

Almost surely, 2^66695655 is an apocalyptic number.

66695655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66695655 is a deficient number, since it is larger than the sum of its proper divisors (48619545).

66695655 is a wasteful number, since it uses less digits than its factorization.

66695655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191.

The product of its digits is 1458000, while the sum is 48.

The square root of 66695655 is about 8166.7407819766. The cubic root of 66695655 is about 405.5388954882.

The spelling of 66695655 in words is "sixty-six million, six hundred ninety-five thousand, six hundred fifty-five".