6640143542 has 4 divisors (see below), whose sum is σ = 9960215316. Its totient is φ = 3320071770.

The previous prime is 6640143529. The next prime is 6640143553. The reversal of 6640143542 is 2453410466.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660035884 + ... + 1660035887.

It is an arithmetic number, because the mean of its divisors is an integer number (2490053829).

Almost surely, 2^6640143542 is an apocalyptic number.

6640143542 is a deficient number, since it is larger than the sum of its proper divisors (3320071774).

6640143542 is a wasteful number, since it uses less digits than its factorization.

6640143542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320071773.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 6640143542 is about 81487.0759200500. The cubic root of 6640143542 is about 1879.5728188537.

The spelling of 6640143542 in words is "six billion, six hundred forty million, one hundred forty-three thousand, five hundred forty-two".