261745641428 has 12 divisors (see below), whose sum is σ = 472830836352. Its totient is φ = 126651116760.

The previous prime is 261745641427. The next prime is 261745641457. The reversal of 261745641428 is 824146547162.

261745641428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261745641427) by changing a digit.

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, 1055425850 + ... + 1055426097.

It is an arithmetic number, because the mean of its divisors is an integer number (39402569696).

Almost surely, 2^261745641428 is an apocalyptic number.

It is an amenable number.

261745641428 is a deficient number, since it is larger than the sum of its proper divisors (211085194924).

261745641428 is a wasteful number, since it uses less digits than its factorization.

261745641428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110851982 (or 2110851980 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 50.

The spelling of 261745641428 in words is "two hundred sixty-one billion, seven hundred forty-five million, six hundred forty-one thousand, four hundred twenty-eight".