66791949 has 24 divisors (see below), whose sum is σ = 106944768. Its totient is φ = 36933120.

The previous prime is 66791939. The next prime is 66791971. The reversal of 66791949 is 94919766.

It is not a de Polignac number, because 66791949 - 2¹¹ = 66789901 is a prime.

It is a super-2 number, since 2×66791949² = 8922328902437202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66791909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2772 + ... + 11885.

It is an arithmetic number, because the mean of its divisors is an integer number (4456032).

Almost surely, 2^66791949 is an apocalyptic number.

It is an amenable number.

66791949 is a deficient number, since it is larger than the sum of its proper divisors (40152819).

66791949 is a wasteful number, since it uses less digits than its factorization.

66791949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14705 (or 14698 counting only the distinct ones).

The product of its digits is 734832, while the sum is 51.

The square root of 66791949 is about 8172.6341530745. The cubic root of 66791949 is about 405.7339715831.

The spelling of 66791949 in words is "sixty-six million, seven hundred ninety-one thousand, nine hundred forty-nine".