261655444513701 has 24 divisors (see below), whose sum is σ = 431939582478144. Its totient is φ = 149517245949120.

The previous prime is 261655444513699. The next prime is 261655444513739. The reversal of 261655444513701 is 107315444556162.

261655444513701 is a `hidden beast` number, since 2 + 6 + 1 + 6 + 5 + 54 + 4 + 4 + 513 + 70 + 1 = 666.

It is not a de Polignac number, because 261655444513701 - 2¹ = 261655444513699 is a prime.

It is a super-3 number, since 3×261655444513701³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261655444513601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99883105 + ... + 102469241.

It is an arithmetic number, because the mean of its divisors is an integer number (17997482603256).

Almost surely, 2^{261655444513701} is an apocalyptic number.

261655444513701 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

261655444513701 is a deficient number, since it is larger than the sum of its proper divisors (170284137964443).

261655444513701 is a wasteful number, since it uses less digits than its factorization.

261655444513701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4192121 (or 4192118 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 54.

The spelling of 261655444513701 in words is "two hundred sixty-one trillion, six hundred fifty-five billion, four hundred forty-four million, five hundred thirteen thousand, seven hundred one".