2991559491648 has 336 divisors, whose sum is σ = 11174357900160. Its totient is φ = 742571753472.

The previous prime is 2991559491647. The next prime is 2991559491677. The reversal of 2991559491648 is 8461949551992.

2991559491648 is a `hidden beast` number, since 2 + 9 + 9 + 1 + 559 + 4 + 9 + 1 + 64 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (2991559491643) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 787558 + ... + 2569701.

It is an arithmetic number, because the mean of its divisors is an integer number (33257017560).

Almost surely, 2^{2991559491648} is an apocalyptic number.

2991559491648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2991559491648 is an abundant number, since it is smaller than the sum of its proper divisors (8182798408512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2991559491648 is a wasteful number, since it uses less digits than its factorization.

2991559491648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3357314 (or 3357301 counting only the distinct ones).

The product of its digits is 251942400, while the sum is 72.

The spelling of 2991559491648 in words is "two trillion, nine hundred ninety-one billion, five hundred fifty-nine million, four hundred ninety-one thousand, six hundred forty-eight".