7801152572981 has 2 divisors, whose sum is σ = 7801152572982. Its totient is φ = 7801152572980.

The previous prime is 7801152572977. The next prime is 7801152572999. The reversal of 7801152572981 is 1892752511087.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6777868592356 + 1023283980625 = 2603434^2 + 1011575^2 .

It is an emirp because it is prime and its reverse (1892752511087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7801152572981 - 2² = 7801152572977 is a prime.

It is a super-2 number, since 2×7801152572981² (a number of 27 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 (7801152572971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3900576286490 + 3900576286491.

It is an arithmetic number, because the mean of its divisors is an integer number (3900576286491).

Almost surely, 2^{7801152572981} is an apocalyptic number.

It is an amenable number.

7801152572981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7801152572981 is an equidigital number, since it uses as much as digits as its factorization.

7801152572981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2822400, while the sum is 56.

The spelling of 7801152572981 in words is "seven trillion, eight hundred one billion, one hundred fifty-two million, five hundred seventy-two thousand, nine hundred eighty-one".