66751851 has 8 divisors (see below), whose sum is σ = 89600400. Its totient is φ = 44202272.

The previous prime is 66751849. The next prime is 66751859. The reversal of 66751851 is 15815766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66751851 - 2¹ = 66751849 is a prime.

It is a super-2 number, since 2×66751851² = 8911619223852402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66751859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74220 + ... + 75113.

It is an arithmetic number, because the mean of its divisors is an integer number (11200050).

Almost surely, 2^66751851 is an apocalyptic number.

66751851 is a deficient number, since it is larger than the sum of its proper divisors (22848549).

66751851 is a wasteful number, since it uses less digits than its factorization.

66751851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149485.

The product of its digits is 50400, while the sum is 39.

The square root of 66751851 is about 8170.1805977591. The cubic root of 66751851 is about 405.6527623066.

The spelling of 66751851 in words is "sixty-six million, seven hundred fifty-one thousand, eight hundred fifty-one".