261201065402 has 16 divisors (see below), whose sum is σ = 392756474592. Its totient is φ = 130282547760.

The previous prime is 261201065399. The next prime is 261201065441. The reversal of 261201065402 is 204560102162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1648148 + ... + 1799664.

It is an arithmetic number, because the mean of its divisors is an integer number (24547279662).

Almost surely, 2^261201065402 is an apocalyptic number.

261201065402 is a deficient number, since it is larger than the sum of its proper divisors (131555409190).

261201065402 is a wasteful number, since it uses less digits than its factorization.

261201065402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153613.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 261201065402 its reverse (204560102162), we get a palindrome (465761167564).

The spelling of 261201065402 in words is "two hundred sixty-one billion, two hundred one million, sixty-five thousand, four hundred two".