665432561642 has 8 divisors (see below), whose sum is σ = 998203230432. Its totient is φ = 332698151500.

The previous prime is 665432561617. The next prime is 665432561663. The reversal of 665432561642 is 246165234566.

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

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, 9018734 + ... + 9092217.

It is an arithmetic number, because the mean of its divisors is an integer number (124775403804).

Almost surely, 2^665432561642 is an apocalyptic number.

665432561642 is a deficient number, since it is larger than the sum of its proper divisors (332770668790).

665432561642 is a wasteful number, since it uses less digits than its factorization.

665432561642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18129324.

The product of its digits is 6220800, while the sum is 50.

The spelling of 665432561642 in words is "six hundred sixty-five billion, four hundred thirty-two million, five hundred sixty-one thousand, six hundred forty-two".