2111551156944 has 30 divisors (see below), whose sum is σ = 5909410529906. Its totient is φ = 703850385600.

The previous prime is 2111551156933. The next prime is 2111551156973. The reversal of 2111551156944 is 4496511551112.

2111551156944 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 551 + 1 + 5 + 6 + 94 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1897285856400 + 214265300544 = 1377420^2 + 462888^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2111551156944.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7331774707 + ... + 7331774994.

Almost surely, 2^{2111551156944} is an apocalyptic number.

2111551156944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2111551156944 is an abundant number, since it is smaller than the sum of its proper divisors (3797859372962).

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

2111551156944 is a wasteful number, since it uses less digits than its factorization.

2111551156944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14663549715 (or 14663549706 counting only the distinct ones).

The product of its digits is 216000, while the sum is 45.

The spelling of 2111551156944 in words is "two trillion, one hundred eleven billion, five hundred fifty-one million, one hundred fifty-six thousand, nine hundred forty-four".