661143434 has 8 divisors (see below), whose sum is σ = 1133388768. Its totient is φ = 283347180.

The previous prime is 661143419. The next prime is 661143443. The reversal of 661143434 is 434341166.

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

It is a super-2 number, since 2×661143434² = 874221280642624712, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 661143434.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23612252 + ... + 23612279.

It is an arithmetic number, because the mean of its divisors is an integer number (141673596).

Almost surely, 2^661143434 is an apocalyptic number.

661143434 is a deficient number, since it is larger than the sum of its proper divisors (472245334).

661143434 is a wasteful number, since it uses less digits than its factorization.

661143434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47224540.

The product of its digits is 20736, while the sum is 32.

The square root of 661143434 is about 25712.7095810613. The cubic root of 661143434 is about 871.1612774380.

The spelling of 661143434 in words is "six hundred sixty-one million, one hundred forty-three thousand, four hundred thirty-four".