66461727 has 4 divisors (see below), whose sum is σ = 88615640. Its totient is φ = 44307816.

The previous prime is 66461723. The next prime is 66461761. The reversal of 66461727 is 72716466.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66461727 - 2² = 66461723 is a prime.

It is a super-2 number, since 2×66461727² = 8834322311645058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66461723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11076952 + ... + 11076957.

It is an arithmetic number, because the mean of its divisors is an integer number (22153910).

Almost surely, 2^66461727 is an apocalyptic number.

66461727 is a deficient number, since it is larger than the sum of its proper divisors (22153913).

66461727 is a wasteful number, since it uses less digits than its factorization.

66461727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22153912.

The product of its digits is 84672, while the sum is 39.

The square root of 66461727 is about 8152.4062092121. The cubic root of 66461727 is about 405.0642117362.

The spelling of 66461727 in words is "sixty-six million, four hundred sixty-one thousand, seven hundred twenty-seven".