66773751 has 8 divisors (see below), whose sum is σ = 97125504. Its totient is φ = 40468920.

The previous prime is 66773731. The next prime is 66773779. The reversal of 66773751 is 15737766.

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

It is not a de Polignac number, because 66773751 - 2⁵ = 66773719 is a prime.

It is a super-2 number, since 2×66773751² = 8917467645220002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66773701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1011691 + ... + 1011756.

It is an arithmetic number, because the mean of its divisors is an integer number (12140688).

Almost surely, 2^66773751 is an apocalyptic number.

66773751 is a deficient number, since it is larger than the sum of its proper divisors (30351753).

66773751 is a wasteful number, since it uses less digits than its factorization.

66773751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023461.

The product of its digits is 185220, while the sum is 42.

The square root of 66773751 is about 8171.5207275023. The cubic root of 66773751 is about 405.6971197489.

The spelling of 66773751 in words is "sixty-six million, seven hundred seventy-three thousand, seven hundred fifty-one".