261388225180137 has 32 divisors (see below), whose sum is σ = 380407567389696. Its totient is φ = 158331065169600.

The previous prime is 261388225180067. The next prime is 261388225180157. The reversal of 261388225180137 is 731081522883162.

It is not a de Polignac number, because 261388225180137 - 2¹⁸ = 261388224917993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261388225180157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2400579498 + ... + 2400688380.

It is an arithmetic number, because the mean of its divisors is an integer number (11887736480928).

Almost surely, 2^{261388225180137} is an apocalyptic number.

It is an amenable number.

261388225180137 is a deficient number, since it is larger than the sum of its proper divisors (119019342209559).

261388225180137 is a wasteful number, since it uses less digits than its factorization.

261388225180137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147741.

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 261388225180137 in words is "two hundred sixty-one trillion, three hundred eighty-eight billion, two hundred twenty-five million, one hundred eighty thousand, one hundred thirty-seven".