77220792973 has 2 divisors, whose sum is σ = 77220792974. Its totient is φ = 77220792972.

The previous prime is 77220792949. The next prime is 77220792977. The reversal of 77220792973 is 37929702277.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53574657444 + 23646135529 = 231462^2 + 153773^2 .

It is an emirp because it is prime and its reverse (37929702277) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77220792973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77220792977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38610396486 + 38610396487.

It is an arithmetic number, because the mean of its divisors is an integer number (38610396487).

Almost surely, 2^77220792973 is an apocalyptic number.

It is an amenable number.

77220792973 is a deficient number, since it is larger than the sum of its proper divisors (1).

77220792973 is an equidigital number, since it uses as much as digits as its factorization.

77220792973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4667544, while the sum is 55.

The spelling of 77220792973 in words is "seventy-seven billion, two hundred twenty million, seven hundred ninety-two thousand, nine hundred seventy-three".