66712755 has 16 divisors (see below), whose sum is σ = 106848000. Its totient is φ = 35544288.

The previous prime is 66712753. The next prime is 66712757. The reversal of 66712755 is 55721766.

It is an interprime number because it is at equal distance from previous prime (66712753) and next prime (66712757).

It is not a de Polignac number, because 66712755 - 2¹ = 66712753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66712753) 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, 20746 + ... + 23744.

It is an arithmetic number, because the mean of its divisors is an integer number (6678000).

Almost surely, 2^66712755 is an apocalyptic number.

66712755 is a deficient number, since it is larger than the sum of its proper divisors (40135245).

66712755 is a wasteful number, since it uses less digits than its factorization.

66712755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4490.

The product of its digits is 88200, while the sum is 39.

The square root of 66712755 is about 8167.7876441543. The cubic root of 66712755 is about 405.5735510318.

The spelling of 66712755 in words is "sixty-six million, seven hundred twelve thousand, seven hundred fifty-five".