66012541 has 4 divisors (see below), whose sum is σ = 75442912. Its totient is φ = 56582172.

The previous prime is 66012539. The next prime is 66012559. The reversal of 66012541 is 14521066.

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 66012541 - 2¹ = 66012539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66012511) 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, 4715175 + ... + 4715188.

It is an arithmetic number, because the mean of its divisors is an integer number (18860728).

Almost surely, 2^66012541 is an apocalyptic number.

It is an amenable number.

66012541 is a deficient number, since it is larger than the sum of its proper divisors (9430371).

66012541 is an equidigital number, since it uses as much as digits as its factorization.

66012541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9430370.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 66012541 is about 8124.8102131681. The cubic root of 66012541 is about 404.1495970023.

The spelling of 66012541 in words is "sixty-six million, twelve thousand, five hundred forty-one".