261223143850 has 24 divisors (see below), whose sum is σ = 486425384640. Its totient is φ = 104370905520.

The previous prime is 261223143821. The next prime is 261223143869. The reversal of 261223143850 is 58341322162.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2914210 + ... + 3002509.

It is an arithmetic number, because the mean of its divisors is an integer number (20267724360).

Almost surely, 2^261223143850 is an apocalyptic number.

261223143850 is a deficient number, since it is larger than the sum of its proper divisors (225202240790).

261223143850 is a wasteful number, since it uses less digits than its factorization.

261223143850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5917614 (or 5917609 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 261223143850 in words is "two hundred sixty-one billion, two hundred twenty-three million, one hundred forty-three thousand, eight hundred fifty".