66461541 has 4 divisors (see below), whose sum is σ = 88615392. Its totient is φ = 44307692.

The previous prime is 66461477. The next prime is 66461557. The reversal of 66461541 is 14516466.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 66461541 - 2⁶ = 66461477 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66461581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11076921 + ... + 11076926.

It is an arithmetic number, because the mean of its divisors is an integer number (22153848).

Almost surely, 2^66461541 is an apocalyptic number.

It is an amenable number.

66461541 is a deficient number, since it is larger than the sum of its proper divisors (22153851).

66461541 is a wasteful number, since it uses less digits than its factorization.

66461541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22153850.

The product of its digits is 17280, while the sum is 33.

The square root of 66461541 is about 8152.3948015292. The cubic root of 66461541 is about 405.0638338646.

The spelling of 66461541 in words is "sixty-six million, four hundred sixty-one thousand, five hundred forty-one".