73776490981 has 2 divisors, whose sum is σ = 73776490982. Its totient is φ = 73776490980.

The previous prime is 73776490961. The next prime is 73776491077. The reversal of 73776490981 is 18909467737.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73500632100 + 275858881 = 271110^2 + 16609^2 .

It is an emirp because it is prime and its reverse (18909467737) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73776490981 is a prime.

It is a super-2 number, since 2×73776490981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73776490901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36888245490 + 36888245491.

It is an arithmetic number, because the mean of its divisors is an integer number (36888245491).

Almost surely, 2^73776490981 is an apocalyptic number.

It is an amenable number.

73776490981 is a deficient number, since it is larger than the sum of its proper divisors (1).

73776490981 is an equidigital number, since it uses as much as digits as its factorization.

73776490981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16003008, while the sum is 61.

The spelling of 73776490981 in words is "seventy-three billion, seven hundred seventy-six million, four hundred ninety thousand, nine hundred eighty-one".