261602231555 has 8 divisors (see below), whose sum is σ = 358768774752. Its totient is φ = 179384387328.

The previous prime is 261602231551. The next prime is 261602231563. The reversal of 261602231555 is 555132206162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261602231555 - 2² = 261602231551 is a prime.

It is a super-3 number, since 3×261602231555³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261602231551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3737174702 + ... + 3737174771.

It is an arithmetic number, because the mean of its divisors is an integer number (44846096844).

Almost surely, 2^261602231555 is an apocalyptic number.

261602231555 is a deficient number, since it is larger than the sum of its proper divisors (97166543197).

261602231555 is an equidigital number, since it uses as much as digits as its factorization.

261602231555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7474349485.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 261602231555 in words is "two hundred sixty-one billion, six hundred two million, two hundred thirty-one thousand, five hundred fifty-five".