91749777667 has 2 divisors, whose sum is σ = 91749777668. Its totient is φ = 91749777666.

The previous prime is 91749777653. The next prime is 91749777671. The reversal of 91749777667 is 76677794719.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91749777667 - 2¹¹ = 91749775619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91749777596 and 91749777605.

It is not a weakly prime, because it can be changed into another prime (91749777167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45874888833 + 45874888834.

It is an arithmetic number, because the mean of its divisors is an integer number (45874888834).

Almost surely, 2^91749777667 is an apocalyptic number.

91749777667 is a deficient number, since it is larger than the sum of its proper divisors (1).

91749777667 is an equidigital number, since it uses as much as digits as its factorization.

91749777667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196036848, while the sum is 70.

The spelling of 91749777667 in words is "ninety-one billion, seven hundred forty-nine million, seven hundred seventy-seven thousand, six hundred sixty-seven".