2991555456 has 64 divisors (see below), whose sum is σ = 7976134800. Its totient is φ = 993443840.

The previous prime is 2991555439. The next prime is 2991555503. The reversal of 2991555456 is 6545551992.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 2991555399 and 2991555408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88816 + ... + 117776.

Almost surely, 2^2991555456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2991555456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3988067400).

2991555456 is an abundant number, since it is smaller than the sum of its proper divisors (4984579344).

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

2991555456 is a wasteful number, since it uses less digits than its factorization.

2991555456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29247 (or 29235 counting only the distinct ones).

The product of its digits is 2430000, while the sum is 51.

The square root of 2991555456 is about 54695.1136391543. The cubic root of 2991555456 is about 1440.8950608257.

The spelling of 2991555456 in words is "two billion, nine hundred ninety-one million, five hundred fifty-five thousand, four hundred fifty-six".