32991857381 has 16 divisors (see below), whose sum is σ = 40577402880. Its totient is φ = 26178958080.

The previous prime is 32991857321. The next prime is 32991857417. The reversal of 32991857381 is 18375819923.

It is a cyclic number.

It is not a de Polignac number, because 32991857381 - 2¹⁰ = 32991856357 is a prime.

It is a super-2 number, since 2×32991857381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32991857321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2265221 + ... + 2279738.

It is an arithmetic number, because the mean of its divisors is an integer number (2536087680).

Almost surely, 2^32991857381 is an apocalyptic number.

It is an amenable number.

32991857381 is a deficient number, since it is larger than the sum of its proper divisors (7585545499).

32991857381 is a wasteful number, since it uses less digits than its factorization.

32991857381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4545044.

The product of its digits is 3265920, while the sum is 56.

The spelling of 32991857381 in words is "thirty-two billion, nine hundred ninety-one million, eight hundred fifty-seven thousand, three hundred eighty-one".