7981423065 has 192 divisors, whose sum is σ = 18218304000. Its totient is φ = 3200601600.

The previous prime is 7981423031. The next prime is 7981423103. The reversal of 7981423065 is 5603241897.

7981423065 is digitally balanced in base 10, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7981423065 - 2⁶ = 7981423001 is a prime.

It is a super-2 number, since 2×7981423065² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

7981423065 is strictly pandigital in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 7981423065.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4922955 + ... + 4924575.

It is an arithmetic number, because the mean of its divisors is an integer number (94887000).

It is a 1-persistent number, because it is pandigital, but 2⋅7981423065 = 15962846130 is not.

Almost surely, 2^7981423065 is an apocalyptic number.

7981423065 is the 72945-th pentagonal number.

It is an amenable number.

7981423065 is an abundant number, since it is smaller than the sum of its proper divisors (10236880935).

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

7981423065 is a wasteful number, since it uses less digits than its factorization.

7981423065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 7981423065 is about 89338.8105192810. The cubic root of 7981423065 is about 1998.4507222625.

The spelling of 7981423065 in words is "seven billion, nine hundred eighty-one million, four hundred twenty-three thousand, sixty-five".