261207499949 has 12 divisors (see below), whose sum is σ = 287381098620. Its totient is φ = 237239112000.

The previous prime is 261207499939. The next prime is 261207499961. The reversal of 261207499949 is 949994702162.

261207499949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 162662989225 + 98544510724 = 403315^2 + 313918^2 .

It is not a de Polignac number, because 261207499949 - 2²⁴ = 261190722733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261207499891 and 261207499900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261207499909) 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 11 ways as a sum of consecutive naturals, for example, 880352 + ... + 1139049.

It is an arithmetic number, because the mean of its divisors is an integer number (23948424885).

Almost surely, 2^261207499949 is an apocalyptic number.

It is an amenable number.

261207499949 is a deficient number, since it is larger than the sum of its proper divisors (26173598671).

261207499949 is a wasteful number, since it uses less digits than its factorization.

261207499949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020492 (or 2020481 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 62.

The spelling of 261207499949 in words is "two hundred sixty-one billion, two hundred seven million, four hundred ninety-nine thousand, nine hundred forty-nine".