16261321658 has 8 divisors (see below), whose sum is σ = 24392530452. Its totient is φ = 8130478176.

The previous prime is 16261321621. The next prime is 16261321679. The reversal of 16261321658 is 85612316261.

It can be written as a sum of positive squares in 2 ways, for example, as 14983473649 + 1277848009 = 122407^2 + 35747^2 .

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

It is a Curzon number.

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, 100766 + ... + 206582.

Almost surely, 2^16261321658 is an apocalyptic number.

16261321658 is a deficient number, since it is larger than the sum of its proper divisors (8131208794).

16261321658 is a wasteful number, since it uses less digits than its factorization.

16261321658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182656.

The product of its digits is 103680, while the sum is 41.

The spelling of 16261321658 in words is "sixteen billion, two hundred sixty-one million, three hundred twenty-one thousand, six hundred fifty-eight".