861570148159 has 4 divisors (see below), whose sum is σ = 984651597904. Its totient is φ = 738488698416.

The previous prime is 861570148121. The next prime is 861570148171. The reversal of 861570148159 is 951841075168.

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

It is not a de Polignac number, because 861570148159 - 2¹¹ = 861570146111 is a prime.

It is a super-2 number, since 2×861570148159² (a number of 25 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 (861570148189) 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, 61540724862 + ... + 61540724875.

It is an arithmetic number, because the mean of its divisors is an integer number (246162899476).

Almost surely, 2^861570148159 is an apocalyptic number.

861570148159 is a deficient number, since it is larger than the sum of its proper divisors (123081449745).

861570148159 is a wasteful number, since it uses less digits than its factorization.

861570148159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123081449744.

The product of its (nonzero) digits is 2419200, while the sum is 55.

The spelling of 861570148159 in words is "eight hundred sixty-one billion, five hundred seventy million, one hundred forty-eight thousand, one hundred fifty-nine".