891616780751 has 2 divisors, whose sum is σ = 891616780752. Its totient is φ = 891616780750.

The previous prime is 891616780729. The next prime is 891616780763. The reversal of 891616780751 is 157087616198.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891616780751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891616780721) 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 as a sum of consecutive naturals, namely, 445808390375 + 445808390376.

It is an arithmetic number, because the mean of its divisors is an integer number (445808390376).

Almost surely, 2^891616780751 is an apocalyptic number.

891616780751 is a deficient number, since it is larger than the sum of its proper divisors (1).

891616780751 is an equidigital number, since it uses as much as digits as its factorization.

891616780751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5080320, while the sum is 59.

The spelling of 891616780751 in words is "eight hundred ninety-one billion, six hundred sixteen million, seven hundred eighty thousand, seven hundred fifty-one".