66798769 has 8 divisors (see below), whose sum is σ = 69047552. Its totient is φ = 64555920.

The previous prime is 66798761. The next prime is 66798773. The reversal of 66798769 is 96789766.

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 66798769 - 2³ = 66798761 is a prime.

It is a super-2 number, since 2×66798769² = 8924151079830722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66798761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44302 + ... + 45784.

It is an arithmetic number, because the mean of its divisors is an integer number (8630944).

Almost surely, 2^66798769 is an apocalyptic number.

It is an amenable number.

66798769 is a deficient number, since it is larger than the sum of its proper divisors (2248783).

66798769 is a wasteful number, since it uses less digits than its factorization.

66798769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967.

The product of its digits is 6858432, while the sum is 58.

The square root of 66798769 is about 8173.0513885574. The cubic root of 66798769 is about 405.7477806901.

The spelling of 66798769 in words is "sixty-six million, seven hundred ninety-eight thousand, seven hundred sixty-nine".