7662137981 has 2 divisors, whose sum is σ = 7662137982. Its totient is φ = 7662137980.

The previous prime is 7662137969. The next prime is 7662138059. The reversal of 7662137981 is 1897312667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5558448025 + 2103689956 = 74555^2 + 45866^2 .

It is a cyclic number.

It is not a de Polignac number, because 7662137981 - 2²² = 7657943677 is a prime.

It is a super-2 number, since 2×7662137981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7662137911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3831068990 + 3831068991.

It is an arithmetic number, because the mean of its divisors is an integer number (3831068991).

Almost surely, 2^7662137981 is an apocalyptic number.

It is an amenable number.

7662137981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7662137981 is an equidigital number, since it uses as much as digits as its factorization.

7662137981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 50.

The square root of 7662137981 is about 87533.6391394760. The cubic root of 7662137981 is about 1971.4389052086.

The spelling of 7662137981 in words is "seven billion, six hundred sixty-two million, one hundred thirty-seven thousand, nine hundred eighty-one".