8025775781 has 8 divisors (see below), whose sum is σ = 8319180000. Its totient is φ = 7733481840.

The previous prime is 8025775763. The next prime is 8025775799. The reversal of 8025775781 is 1875775208.

It is an interprime number because it is at equal distance from previous prime (8025775763) and next prime (8025775799).

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 8025775781 - 2⁶ = 8025775717 is a prime.

It is a super-2 number, since 2×8025775781² (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 (8025775081) 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, 262835 + ... + 291776.

It is an arithmetic number, because the mean of its divisors is an integer number (1039897500).

Almost surely, 2^8025775781 is an apocalyptic number.

It is an amenable number.

8025775781 is a deficient number, since it is larger than the sum of its proper divisors (293404219).

8025775781 is a wasteful number, since it uses less digits than its factorization.

8025775781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555139.

The product of its (nonzero) digits is 1097600, while the sum is 50.

The square root of 8025775781 is about 89586.6942185055. The cubic root of 8025775781 is about 2002.1456789577.

The spelling of 8025775781 in words is "eight billion, twenty-five million, seven hundred seventy-five thousand, seven hundred eighty-one".