2051274777991 has 2 divisors, whose sum is σ = 2051274777992. Its totient is φ = 2051274777990.

The previous prime is 2051274777973. The next prime is 2051274778043. The reversal of 2051274777991 is 1997774721502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2051274777991 - 2²¹ = 2051272680839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2051274777091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025637388995 + 1025637388996.

It is an arithmetic number, because the mean of its divisors is an integer number (1025637388996).

Almost surely, 2^{2051274777991} is an apocalyptic number.

2051274777991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051274777991 is an equidigital number, since it uses as much as digits as its factorization.

2051274777991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15558480, while the sum is 61.

The spelling of 2051274777991 in words is "two trillion, fifty-one billion, two hundred seventy-four million, seven hundred seventy-seven thousand, nine hundred ninety-one".