77975293091 has 2 divisors, whose sum is σ = 77975293092. Its totient is φ = 77975293090.

The previous prime is 77975293079. The next prime is 77975293157. The reversal of 77975293091 is 19039257977.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77975293091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77975293091.

It is not a weakly prime, because it can be changed into another prime (77975293691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38987646545 + 38987646546.

It is an arithmetic number, because the mean of its divisors is an integer number (38987646546).

Almost surely, 2^77975293091 is an apocalyptic number.

77975293091 is a deficient number, since it is larger than the sum of its proper divisors (1).

77975293091 is an equidigital number, since it uses as much as digits as its factorization.

77975293091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7501410, while the sum is 59.

The spelling of 77975293091 in words is "seventy-seven billion, nine hundred seventy-five million, two hundred ninety-three thousand, ninety-one".