261898905742 has 8 divisors (see below), whose sum is σ = 392852185776. Its totient is φ = 130948177152.

The previous prime is 261898905731. The next prime is 261898905787. The reversal of 261898905742 is 247509898162.

261898905742 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 356403 + ... + 806734.

It is an arithmetic number, because the mean of its divisors is an integer number (49106523222).

Almost surely, 2^261898905742 is an apocalyptic number.

261898905742 is a deficient number, since it is larger than the sum of its proper divisors (130953280034).

261898905742 is a wasteful number, since it uses less digits than its factorization.

261898905742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275722.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 261898905742 in words is "two hundred sixty-one billion, eight hundred ninety-eight million, nine hundred five thousand, seven hundred forty-two".