66011649 has 8 divisors (see below), whose sum is σ = 96016992. Its totient is φ = 40007040.

The previous prime is 66011639. The next prime is 66011657. The reversal of 66011649 is 94611066.

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

It is not a de Polignac number, because 66011649 - 2⁹ = 66011137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2000353 = 66011649 / (6 + 6 + 0 + 1 + 1 + 6 + 4 + 9).

It is not an unprimeable number, because it can be changed into a prime (66011639) 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, 1000144 + ... + 1000209.

It is an arithmetic number, because the mean of its divisors is an integer number (12002124).

Almost surely, 2^66011649 is an apocalyptic number.

It is an amenable number.

66011649 is a deficient number, since it is larger than the sum of its proper divisors (30005343).

66011649 is a wasteful number, since it uses less digits than its factorization.

66011649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000367.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 66011649 is about 8124.7553193927. The cubic root of 66011649 is about 404.1477766257.

The spelling of 66011649 in words is "sixty-six million, eleven thousand, six hundred forty-nine".