73778834971 has 2 divisors, whose sum is σ = 73778834972. Its totient is φ = 73778834970.

The previous prime is 73778834911. The next prime is 73778834981. The reversal of 73778834971 is 17943887737.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (17943887737) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73778834971 is a prime.

It is not a weakly prime, because it can be changed into another prime (73778834911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36889417485 + 36889417486.

It is an arithmetic number, because the mean of its divisors is an integer number (36889417486).

Almost surely, 2^73778834971 is an apocalyptic number.

73778834971 is a deficient number, since it is larger than the sum of its proper divisors (1).

73778834971 is an equidigital number, since it uses as much as digits as its factorization.

73778834971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49787136, while the sum is 64.

The spelling of 73778834971 in words is "seventy-three billion, seven hundred seventy-eight million, eight hundred thirty-four thousand, nine hundred seventy-one".