66997948 has 6 divisors (see below), whose sum is σ = 117246416. Its totient is φ = 33498972.

The previous prime is 66997939. The next prime is 66997949. The reversal of 66997948 is 84979966.

It is a junction number, because it is equal to n+sod(n) for n = 66997892 and 66997901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66997949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8374740 + ... + 8374747.

Almost surely, 2^66997948 is an apocalyptic number.

It is an amenable number.

66997948 is a deficient number, since it is larger than the sum of its proper divisors (50248468).

66997948 is a wasteful number, since it uses less digits than its factorization.

66997948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16749491 (or 16749489 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 58.

The square root of 66997948 is about 8185.2274250628. The cubic root of 66997948 is about 406.1506635860.

The spelling of 66997948 in words is "sixty-six million, nine hundred ninety-seven thousand, nine hundred forty-eight".