66779541 has 12 divisors (see below), whose sum is σ = 96887232. Its totient is φ = 44322216.

The previous prime is 66779533. The next prime is 66779543. The reversal of 66779541 is 14597766.

It is a happy number.

It is not a de Polignac number, because 66779541 - 2³ = 66779533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66779543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14301 + ... + 18386.

It is an arithmetic number, because the mean of its divisors is an integer number (8073936).

Almost surely, 2^66779541 is an apocalyptic number.

It is an amenable number.

66779541 is a deficient number, since it is larger than the sum of its proper divisors (30107691).

66779541 is a wasteful number, since it uses less digits than its factorization.

66779541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32920 (or 32917 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 66779541 is about 8171.8749990440. The cubic root of 66779541 is about 405.7088455064.

It can be divided in two parts, 667 and 79541, that added together give a palindrome (80208).

The spelling of 66779541 in words is "sixty-six million, seven hundred seventy-nine thousand, five hundred forty-one".