261199156839 has 16 divisors (see below), whose sum is σ = 352714091520. Its totient is φ = 171908998560.

The previous prime is 261199156837. The next prime is 261199156873. The reversal of 261199156839 is 938651991162.

It is not a de Polignac number, because 261199156839 - 2¹ = 261199156837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261199156837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2196169 + ... + 2312045.

It is an arithmetic number, because the mean of its divisors is an integer number (22044630720).

Almost surely, 2^261199156839 is an apocalyptic number.

261199156839 is a deficient number, since it is larger than the sum of its proper divisors (91514934681).

261199156839 is a wasteful number, since it uses less digits than its factorization.

261199156839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125470.

The product of its digits is 6298560, while the sum is 60.

The spelling of 261199156839 in words is "two hundred sixty-one billion, one hundred ninety-nine million, one hundred fifty-six thousand, eight hundred thirty-nine".