66437968 has 10 divisors (see below), whose sum is σ = 128723594. Its totient is φ = 33218976.

The previous prime is 66437951. The next prime is 66437983. The reversal of 66437968 is 86973466.

It can be written as a sum of positive squares in only one way, i.e., 58553104 + 7884864 = 7652^2 + 2808^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2076171 + ... + 2076202.

Almost surely, 2^66437968 is an apocalyptic number.

It is an amenable number.

66437968 is a deficient number, since it is larger than the sum of its proper divisors (62285626).

66437968 is a wasteful number, since it uses less digits than its factorization.

66437968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4152381 (or 4152375 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 49.

The square root of 66437968 is about 8150.9489018151. The cubic root of 66437968 is about 405.0159380000.

The spelling of 66437968 in words is "sixty-six million, four hundred thirty-seven thousand, nine hundred sixty-eight".