771407047991 has 2 divisors, whose sum is σ = 771407047992. Its totient is φ = 771407047990.

The previous prime is 771407047981. The next prime is 771407048023. The reversal of 771407047991 is 199740704177.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 771407047991 - 2¹⁴ = 771407031607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (771407047981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385703523995 + 385703523996.

It is an arithmetic number, because the mean of its divisors is an integer number (385703523996).

Almost surely, 2^771407047991 is an apocalyptic number.

771407047991 is a deficient number, since it is larger than the sum of its proper divisors (1).

771407047991 is an equidigital number, since it uses as much as digits as its factorization.

771407047991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3111696, while the sum is 56.

The spelling of 771407047991 in words is "seven hundred seventy-one billion, four hundred seven million, forty-seven thousand, nine hundred ninety-one".