2051121156551 has 2 divisors, whose sum is σ = 2051121156552. Its totient is φ = 2051121156550.

The previous prime is 2051121156523. The next prime is 2051121156571. The reversal of 2051121156551 is 1556511211502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2051121156551 is a prime.

It is a super-2 number, since 2×2051121156551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2051121156571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025560578275 + 1025560578276.

It is an arithmetic number, because the mean of its divisors is an integer number (1025560578276).

Almost surely, 2^{2051121156551} is an apocalyptic number.

2051121156551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051121156551 is an equidigital number, since it uses as much as digits as its factorization.

2051121156551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15000, while the sum is 35.

The spelling of 2051121156551 in words is "two trillion, fifty-one billion, one hundred twenty-one million, one hundred fifty-six thousand, five hundred fifty-one".