861133828501 has 4 divisors (see below), whose sum is σ = 906456661600. Its totient is φ = 815810995404.

The previous prime is 861133828493. The next prime is 861133828523. The reversal of 861133828501 is 105828331168.

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 861133828501 - 2³ = 861133828493 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 (861133828531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22661416521 + ... + 22661416558.

It is an arithmetic number, because the mean of its divisors is an integer number (226614165400).

Almost surely, 2^861133828501 is an apocalyptic number.

It is an amenable number.

861133828501 is a deficient number, since it is larger than the sum of its proper divisors (45322833099).

861133828501 is a wasteful number, since it uses less digits than its factorization.

861133828501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45322833098.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 861133828501 in words is "eight hundred sixty-one billion, one hundred thirty-three million, eight hundred twenty-eight thousand, five hundred one".