66407541 has 4 divisors (see below), whose sum is σ = 88543392. Its totient is φ = 44271692.

The previous prime is 66407533. The next prime is 66407543. The reversal of 66407541 is 14570466.

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 66407541 - 2³ = 66407533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66407543) 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, 11067921 + ... + 11067926.

It is an arithmetic number, because the mean of its divisors is an integer number (22135848).

Almost surely, 2^66407541 is an apocalyptic number.

It is an amenable number.

66407541 is a deficient number, since it is larger than the sum of its proper divisors (22135851).

66407541 is a wasteful number, since it uses less digits than its factorization.

66407541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22135850.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 66407541 is about 8149.0822182624. The cubic root of 66407541 is about 404.9540993553.

The spelling of 66407541 in words is "sixty-six million, four hundred seven thousand, five hundred forty-one".