3984864550491 has 16 divisors (see below), whose sum is σ = 5796210326400. Its totient is φ = 2415051213120.

The previous prime is 3984864550489. The next prime is 3984864550523. The reversal of 3984864550491 is 1940554684893.

It is not a de Polignac number, because 3984864550491 - 2¹ = 3984864550489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3984864550691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4942335 + ... + 5691783.

It is an arithmetic number, because the mean of its divisors is an integer number (362263145400).

Almost surely, 2^{3984864550491} is an apocalyptic number.

3984864550491 is a deficient number, since it is larger than the sum of its proper divisors (1811345775909).

3984864550491 is a wasteful number, since it uses less digits than its factorization.

3984864550491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910586.

The product of its (nonzero) digits is 149299200, while the sum is 66.

The spelling of 3984864550491 in words is "three trillion, nine hundred eighty-four billion, eight hundred sixty-four million, five hundred fifty thousand, four hundred ninety-one".