66791908 has 12 divisors (see below), whose sum is σ = 121968000. Its totient is φ = 31943912.

The previous prime is 66791899. The next prime is 66791909. The reversal of 66791908 is 80919766.

It is a super-2 number, since 2×66791908² = 8922317948560928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

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 3 ways as a sum of consecutive naturals, for example, 362908 + ... + 363091.

It is an arithmetic number, because the mean of its divisors is an integer number (10164000).

Almost surely, 2^66791908 is an apocalyptic number.

It is an amenable number.

66791908 is a deficient number, since it is larger than the sum of its proper divisors (55176092).

66791908 is a wasteful number, since it uses less digits than its factorization.

66791908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726026 (or 726024 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 66791908 is about 8172.6316447029. The cubic root of 66791908 is about 405.7338885636.

The spelling of 66791908 in words is "sixty-six million, seven hundred ninety-one thousand, nine hundred eight".