261120021105770 has 64 divisors (see below), whose sum is σ = 489310348331520. Its totient is φ = 100262085677568.

The previous prime is 261120021105731. The next prime is 261120021105833. The reversal of 261120021105770 is 77501120021162.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261120021105770.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15117197 + ... + 27400176.

It is an arithmetic number, because the mean of its divisors is an integer number (7645474192680).

Almost surely, 2^{261120021105770} is an apocalyptic number.

261120021105770 is a deficient number, since it is larger than the sum of its proper divisors (228190327225750).

261120021105770 is a wasteful number, since it uses less digits than its factorization.

261120021105770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42517679.

The product of its (nonzero) digits is 11760, while the sum is 35.

The spelling of 261120021105770 in words is "two hundred sixty-one trillion, one hundred twenty billion, twenty-one million, one hundred five thousand, seven hundred seventy".