66441761 has 4 divisors (see below), whose sum is σ = 66720000. Its totient is φ = 66163524.

The previous prime is 66441743. The next prime is 66441769. The reversal of 66441761 is 16714466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16714466 = 2 ⋅8357233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66441761 is a prime.

It is a super-2 number, since 2×66441761² = 8829015209562242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66441769) 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, 138761 + ... + 139238.

It is an arithmetic number, because the mean of its divisors is an integer number (16680000).

Almost surely, 2^66441761 is an apocalyptic number.

It is an amenable number.

66441761 is a deficient number, since it is larger than the sum of its proper divisors (278239).

66441761 is a wasteful number, since it uses less digits than its factorization.

66441761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278238.

The product of its digits is 24192, while the sum is 35.

The square root of 66441761 is about 8151.1815707908. The cubic root of 66441761 is about 405.0236454213.

The spelling of 66441761 in words is "sixty-six million, four hundred forty-one thousand, seven hundred sixty-one".