861540153847 has 4 divisors (see below), whose sum is σ = 861836320440. Its totient is φ = 861243987256.

The previous prime is 861540153829. The next prime is 861540153869. The reversal of 861540153847 is 748351045168.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 861540153847 - 2²⁷ = 861405936119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861540153794 and 861540153803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861540153247) 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, 148078933 + ... + 148084750.

It is an arithmetic number, because the mean of its divisors is an integer number (215459080110).

Almost surely, 2^861540153847 is an apocalyptic number.

861540153847 is a deficient number, since it is larger than the sum of its proper divisors (296166593).

861540153847 is a wasteful number, since it uses less digits than its factorization.

861540153847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296166592.

The product of its (nonzero) digits is 3225600, while the sum is 52.

The spelling of 861540153847 in words is "eight hundred sixty-one billion, five hundred forty million, one hundred fifty-three thousand, eight hundred forty-seven".