261201065403 has 8 divisors (see below), whose sum is σ = 363410178048. Its totient is φ = 166562998184.

The previous prime is 261201065399. The next prime is 261201065441. The reversal of 261201065403 is 304560102162.

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 261201065403 - 2² = 261201065399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261201065483) 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, 1892761275 + ... + 1892761412.

It is an arithmetic number, because the mean of its divisors is an integer number (45426272256).

Almost surely, 2^261201065403 is an apocalyptic number.

261201065403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

261201065403 is a deficient number, since it is larger than the sum of its proper divisors (102209112645).

261201065403 is a wasteful number, since it uses less digits than its factorization.

261201065403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3785522713.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 261201065403 its reverse (304560102162), we get a palindrome (565761167565).

The spelling of 261201065403 in words is "two hundred sixty-one billion, two hundred one million, sixty-five thousand, four hundred three".