7621976738881 has 2 divisors, whose sum is σ = 7621976738882. Its totient is φ = 7621976738880.

The previous prime is 7621976738833. The next prime is 7621976738891. The reversal of 7621976738881 is 1888376791267.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6392761048881 + 1229215690000 = 2528391^2 + 1108700^2 .

It is a cyclic number.

It is not a de Polignac number, because 7621976738881 - 2¹⁷ = 7621976607809 is a prime.

It is a super-2 number, since 2×7621976738881² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7621976738821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3810988369440 + 3810988369441.

It is an arithmetic number, because the mean of its divisors is an integer number (3810988369441).

Almost surely, 2^{7621976738881} is an apocalyptic number.

It is an amenable number.

7621976738881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7621976738881 is an equidigital number, since it uses as much as digits as its factorization.

7621976738881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 341397504, while the sum is 73.

The spelling of 7621976738881 in words is "seven trillion, six hundred twenty-one billion, nine hundred seventy-six million, seven hundred thirty-eight thousand, eight hundred eighty-one".