7981771423501 has 4 divisors (see below), whose sum is σ = 7981784604832. Its totient is φ = 7981758242172.

The previous prime is 7981771423499. The next prime is 7981771423529. The reversal of 7981771423501 is 1053241771897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7981771423501 - 2¹ = 7981771423499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7981771427501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5636295 + ... + 6908788.

It is an arithmetic number, because the mean of its divisors is an integer number (1995446151208).

Almost surely, 2^{7981771423501} is an apocalyptic number.

It is an amenable number.

7981771423501 is a deficient number, since it is larger than the sum of its proper divisors (13181331).

7981771423501 is a wasteful number, since it uses less digits than its factorization.

7981771423501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13181330.

The product of its (nonzero) digits is 2963520, while the sum is 55.

The spelling of 7981771423501 in words is "seven trillion, nine hundred eighty-one billion, seven hundred seventy-one million, four hundred twenty-three thousand, five hundred one".