2051121156556 has 12 divisors (see below), whose sum is σ = 3589481248920. Its totient is φ = 1025555085440.

The previous prime is 2051121156551. The next prime is 2051121156571. The reversal of 2051121156556 is 6556511211502.

It is a super-2 number, since 2×2051121156556² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2051121156551) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 466501 + ... + 2078428.

It is an arithmetic number, because the mean of its divisors is an integer number (299123437410).

Almost surely, 2^{2051121156556} is an apocalyptic number.

It is an amenable number.

2051121156556 is a deficient number, since it is larger than the sum of its proper divisors (1538360092364).

2051121156556 is a wasteful number, since it uses less digits than its factorization.

2051121156556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2746424 (or 2746422 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 40.

The spelling of 2051121156556 in words is "two trillion, fifty-one billion, one hundred twenty-one million, one hundred fifty-six thousand, five hundred fifty-six".