261354603812 has 24 divisors (see below), whose sum is σ = 488896636032. Its totient is φ = 121947003200.

The previous prime is 261354603803. The next prime is 261354603833. The reversal of 261354603812 is 218306453162.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a self number, because there is not a number n which added to its sum of digits gives 261354603812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34640264 + ... + 34647807.

It is an arithmetic number, because the mean of its divisors is an integer number (20370693168).

Almost surely, 2^261354603812 is an apocalyptic number.

It is an amenable number.

261354603812 is a deficient number, since it is larger than the sum of its proper divisors (227542032220).

261354603812 is a wasteful number, since it uses less digits than its factorization.

261354603812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69288139 (or 69288137 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 261354603812 in words is "two hundred sixty-one billion, three hundred fifty-four million, six hundred three thousand, eight hundred twelve".