261700551020 has 48 divisors (see below), whose sum is σ = 586480849920. Its totient is φ = 97746776064.

The previous prime is 261700551019. The next prime is 261700551043. The reversal of 261700551020 is 20155007162.

261700551020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2987165 + ... + 3073524.

It is an arithmetic number, because the mean of its divisors is an integer number (12218351040).

Almost surely, 2^261700551020 is an apocalyptic number.

261700551020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261700551020 is an abundant number, since it is smaller than the sum of its proper divisors (324780298900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261700551020 is a wasteful number, since it uses less digits than its factorization.

261700551020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060842 (or 6060840 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

Adding to 261700551020 its reverse (20155007162), we get a palindrome (281855558182).

The spelling of 261700551020 in words is "two hundred sixty-one billion, seven hundred million, five hundred fifty-one thousand, twenty".