66111748 has 18 divisors (see below), whose sum is σ = 118916826. Its totient is φ = 32159808.

The previous prime is 66111743. The next prime is 66111757. The reversal of 66111748 is 84711166.

It can be written as a sum of positive squares in 3 ways, for example, as 16662724 + 49449024 = 4082^2 + 7032^2 .

It is not an unprimeable number, because it can be changed into a prime (66111743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 561 + ... + 11512.

Almost surely, 2^66111748 is an apocalyptic number.

It is an amenable number.

66111748 is a deficient number, since it is larger than the sum of its proper divisors (52805078).

66111748 is a wasteful number, since it uses less digits than its factorization.

66111748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12151 (or 12112 counting only the distinct ones).

The product of its digits is 8064, while the sum is 34.

The square root of 66111748 is about 8130.9131098543. The cubic root of 66111748 is about 404.3519545134.

It can be divided in two parts, 6611 and 1748, that multiplied together give a triangular number (11556028 = T₄₈₀₇).

The spelling of 66111748 in words is "sixty-six million, one hundred eleven thousand, seven hundred forty-eight".