3991616562554 has 8 divisors (see below), whose sum is σ = 6247747663200. Its totient is φ = 1909034008156.

The previous prime is 3991616562473. The next prime is 3991616562559. The reversal of 3991616562554 is 4552656161993.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (3991616562559) 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 3 ways as a sum of consecutive naturals, for example, 43387136504 + ... + 43387136595.

It is an arithmetic number, because the mean of its divisors is an integer number (780968457900).

Almost surely, 2^{3991616562554} is an apocalyptic number.

3991616562554 is a deficient number, since it is larger than the sum of its proper divisors (2256131100646).

3991616562554 is a wasteful number, since it uses less digits than its factorization.

3991616562554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86774273124.

The product of its digits is 52488000, while the sum is 62.

The spelling of 3991616562554 in words is "three trillion, nine hundred ninety-one billion, six hundred sixteen million, five hundred sixty-two thousand, five hundred fifty-four".