66677797 has 8 divisors (see below), whose sum is σ = 68279616. Its totient is φ = 65093952.

The previous prime is 66677789. The next prime is 66677813. The reversal of 66677797 is 79777666.

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 66677797 - 2³ = 66677789 is a prime.

It is a super-2 number, since 2×66677797² = 8891857225546418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677777) 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, 3168 + ... + 11974.

It is an arithmetic number, because the mean of its divisors is an integer number (8534952).

Almost surely, 2^66677797 is an apocalyptic number.

66677797 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

66677797 is a deficient number, since it is larger than the sum of its proper divisors (1601819).

66677797 is a wasteful number, since it uses less digits than its factorization.

66677797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8987.

The product of its digits is 4667544, while the sum is 55.

The square root of 66677797 is about 8165.6473717642. The cubic root of 66677797 is about 405.5026974277.

The spelling of 66677797 in words is "sixty-six million, six hundred seventy-seven thousand, seven hundred ninety-seven".