661143063 has 8 divisors (see below), whose sum is σ = 1007456128. Its totient is φ = 377796024.

The previous prime is 661143023. The next prime is 661143083. The reversal of 661143063 is 360341166.

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

It is not a de Polignac number, because 661143063 - 2¹⁰ = 661142039 is a prime.

It is a super-2 number, since 2×661143063² = 874220299506043938, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661143063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661143013) 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, 15741481 + ... + 15741522.

It is an arithmetic number, because the mean of its divisors is an integer number (125932016).

Almost surely, 2^661143063 is an apocalyptic number.

661143063 is a deficient number, since it is larger than the sum of its proper divisors (346313065).

661143063 is a wasteful number, since it uses less digits than its factorization.

661143063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31483013.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 661143063 is about 25712.7023667292. The cubic root of 661143063 is about 871.1611144876.

The spelling of 661143063 in words is "six hundred sixty-one million, one hundred forty-three thousand, sixty-three".