261207499950 has 120 divisors (see below), whose sum is σ = 734957736480. Its totient is φ = 68773536000.

The previous prime is 261207499939. The next prime is 261207499961. The reversal of 261207499950 is 59994702162.

261207499950 is a `hidden beast` number, since 2 + 61 + 2 + 0 + 7 + 499 + 95 + 0 = 666.

261207499950 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261207499939) and next prime (261207499961).

It is a Harshad number since it is a multiple of its sum of digits (54).

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 59 ways as a sum of consecutive naturals, for example, 88251 + ... + 728150.

It is an arithmetic number, because the mean of its divisors is an integer number (6124647804).

Almost surely, 2^261207499950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261207499950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (367478868240).

261207499950 is an abundant number, since it is smaller than the sum of its proper divisors (473750236530).

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

261207499950 is a wasteful number, since it uses less digits than its factorization.

261207499950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816504 (or 816490 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 261207499950 in words is "two hundred sixty-one billion, two hundred seven million, four hundred ninety-nine thousand, nine hundred fifty".