66533949 has 12 divisors (see below), whose sum is σ = 97096636. Its totient is φ = 43898112.

The previous prime is 66533947. The next prime is 66533977. The reversal of 66533949 is 94933566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 36360900 + 30173049 = 6030^2 + 5493^2 .

It is not a de Polignac number, because 66533949 - 2¹ = 66533947 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 (66533941) 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, 37234 + ... + 38979.

Almost surely, 2^66533949 is an apocalyptic number.

It is an amenable number.

66533949 is a deficient number, since it is larger than the sum of its proper divisors (30562687).

66533949 is a wasteful number, since it uses less digits than its factorization.

66533949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76316 (or 76313 counting only the distinct ones).

The product of its digits is 524880, while the sum is 45.

The square root of 66533949 is about 8156.8344962982. The cubic root of 66533949 is about 405.2108824018.

The spelling of 66533949 in words is "sixty-six million, five hundred thirty-three thousand, nine hundred forty-nine".