7997825981 has 8 divisors (see below), whose sum is σ = 8150220000. Its totient is φ = 7845487312.

The previous prime is 7997825977. The next prime is 7997826029. The reversal of 7997825981 is 1895287997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7997825981 - 2² = 7997825977 is a prime.

It is a super-2 number, since 2×7997825981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7997825911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387386 + ... + 407508.

It is an arithmetic number, because the mean of its divisors is an integer number (1018777500).

Almost surely, 2^7997825981 is an apocalyptic number.

It is an amenable number.

7997825981 is a deficient number, since it is larger than the sum of its proper divisors (152394019).

7997825981 is a wasteful number, since it uses less digits than its factorization.

7997825981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27675.

The product of its digits is 22861440, while the sum is 65.

The square root of 7997825981 is about 89430.5651385476. The cubic root of 7997825981 is about 1999.8188153366.

The spelling of 7997825981 in words is "seven billion, nine hundred ninety-seven million, eight hundred twenty-five thousand, nine hundred eighty-one".