66693851 has 6 divisors (see below), whose sum is σ = 77582700. Its totient is φ = 57166116.

The previous prime is 66693833. The next prime is 66693871. The reversal of 66693851 is 15839666.

It is a de Polignac number, because none of the positive numbers 2^k-66693851 is a prime.

It is a super-2 number, since 2×66693851² = 8896139522420402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66693811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 680501 + ... + 680598.

It is an arithmetic number, because the mean of its divisors is an integer number (12930450).

Almost surely, 2^66693851 is an apocalyptic number.

66693851 is a deficient number, since it is larger than the sum of its proper divisors (10888849).

66693851 is a wasteful number, since it uses less digits than its factorization.

66693851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361113 (or 1361106 counting only the distinct ones).

The product of its digits is 233280, while the sum is 44.

The square root of 66693851 is about 8166.6303332525. The cubic root of 66693851 is about 405.5352390843.

The spelling of 66693851 in words is "sixty-six million, six hundred ninety-three thousand, eight hundred fifty-one".