66461143 has 8 divisors (see below), whose sum is σ = 80423712. Its totient is φ = 53615616.

The previous prime is 66461137. The next prime is 66461167. The reversal of 66461143 is 34116466.

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 66461143 - 2¹³ = 66452951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66461113) 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, 279130 + ... + 279367.

It is an arithmetic number, because the mean of its divisors is an integer number (10052964).

Almost surely, 2^66461143 is an apocalyptic number.

66461143 is a deficient number, since it is larger than the sum of its proper divisors (13962569).

66461143 is a wasteful number, since it uses less digits than its factorization.

66461143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558521.

The product of its digits is 10368, while the sum is 31.

The square root of 66461143 is about 8152.3703914874. The cubic root of 66461143 is about 405.0630252981.

The spelling of 66461143 in words is "sixty-six million, four hundred sixty-one thousand, one hundred forty-three".