261665054416022 has 16 divisors (see below), whose sum is σ = 393357914258400. Its totient is φ = 130545751812288.

The previous prime is 261665054416021. The next prime is 261665054416049. The reversal of 261665054416022 is 220614450566162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261665054416021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448435823 + ... + 449018949.

It is an arithmetic number, because the mean of its divisors is an integer number (24584869641150).

Almost surely, 2^{261665054416022} is an apocalyptic number.

261665054416022 is a deficient number, since it is larger than the sum of its proper divisors (131692859842378).

261665054416022 is a wasteful number, since it uses less digits than its factorization.

261665054416022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074535.

The product of its (nonzero) digits is 4147200, while the sum is 50.

The spelling of 261665054416022 in words is "two hundred sixty-one trillion, six hundred sixty-five billion, fifty-four million, four hundred sixteen thousand, twenty-two".