7981551626895 has 192 divisors, whose sum is σ = 17586041601024. Its totient is φ = 3252172584960.

The previous prime is 7981551626863. The next prime is 7981551626897. The reversal of 7981551626895 is 5986261551897.

7981551626895 is a `hidden beast` number, since 7 + 9 + 8 + 1 + 5 + 516 + 26 + 89 + 5 = 666.

It is a Cunningham number, because it is equal to 2825164²-1.

It is not a de Polignac number, because 7981551626895 - 2⁵ = 7981551626863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7981551626897) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 279677067 + ... + 279705603.

It is an arithmetic number, because the mean of its divisors is an integer number (91593966672).

Almost surely, 2^{7981551626895} is an apocalyptic number.

7981551626895 is an abundant number, since it is smaller than the sum of its proper divisors (9604489974129).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7981551626895 is a wasteful number, since it uses less digits than its factorization.

7981551626895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30142 (or 30139 counting only the distinct ones).

The product of its digits is 326592000, while the sum is 72.

The spelling of 7981551626895 in words is "seven trillion, nine hundred eighty-one billion, five hundred fifty-one million, six hundred twenty-six thousand, eight hundred ninety-five".