66770997 has 8 divisors (see below), whose sum is σ = 93713760. Its totient is φ = 42171120.

The previous prime is 66770987. The next prime is 66771011. The reversal of 66770997 is 79907766.

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

It is not a de Polignac number, because 66770997 - 2⁴ = 66770981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66770987) 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, 585654 + ... + 585767.

It is an arithmetic number, because the mean of its divisors is an integer number (11714220).

Almost surely, 2^66770997 is an apocalyptic number.

It is an amenable number.

66770997 is a deficient number, since it is larger than the sum of its proper divisors (26942763).

66770997 is a wasteful number, since it uses less digits than its factorization.

66770997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171443.

The product of its (nonzero) digits is 1000188, while the sum is 51.

The square root of 66770997 is about 8171.3522136792. The cubic root of 66770997 is about 405.6915421818.

The spelling of 66770997 in words is "sixty-six million, seven hundred seventy thousand, nine hundred ninety-seven".