66949541 has 4 divisors (see below), whose sum is σ = 67866732. Its totient is φ = 66032352.

The previous prime is 66949537. The next prime is 66949591. The reversal of 66949541 is 14594966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14594966 = 2 ⋅7297483.

It can be written as a sum of positive squares in 2 ways, for example, as 50708641 + 16240900 = 7121^2 + 4030^2 .

It is a cyclic number.

It is not a de Polignac number, because 66949541 - 2² = 66949537 is a prime.

It is a super-2 number, since 2×66949541² = 8964482080221362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66949492 and 66949501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66949591) 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, 458486 + ... + 458631.

It is an arithmetic number, because the mean of its divisors is an integer number (16966683).

Almost surely, 2^66949541 is an apocalyptic number.

It is an amenable number.

66949541 is a deficient number, since it is larger than the sum of its proper divisors (917191).

66949541 is an equidigital number, since it uses as much as digits as its factorization.

66949541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917190.

The product of its digits is 233280, while the sum is 44.

The square root of 66949541 is about 8182.2699173273. The cubic root of 66949541 is about 406.0528234149.

The spelling of 66949541 in words is "sixty-six million, nine hundred forty-nine thousand, five hundred forty-one".