66111461 has 4 divisors (see below), whose sum is σ = 71196972. Its totient is φ = 61025952.

The previous prime is 66111457. The next prime is 66111491. The reversal of 66111461 is 16411166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42003361 + 24108100 = 6481^2 + 4910^2 .

It is not a de Polignac number, because 66111461 - 2² = 66111457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66111461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66111421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2542736 + ... + 2542761.

It is an arithmetic number, because the mean of its divisors is an integer number (17799243).

Almost surely, 2^66111461 is an apocalyptic number.

It is an amenable number.

66111461 is a deficient number, since it is larger than the sum of its proper divisors (5085511).

66111461 is a wasteful number, since it uses less digits than its factorization.

66111461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5085510.

The product of its digits is 864, while the sum is 26.

The square root of 66111461 is about 8130.8954611408. The cubic root of 66111461 is about 404.3513693971.

The spelling of 66111461 in words is "sixty-six million, one hundred eleven thousand, four hundred sixty-one".