261958403002 has 16 divisors (see below), whose sum is σ = 398350650600. Its totient is φ = 129175126272.

The previous prime is 261958402997. The next prime is 261958403039. The reversal of 261958403002 is 200304859162.

It can be written as a sum of positive squares in 4 ways, for example, as 219249634081 + 42708768921 = 468241^2 + 206661^2 .

It is a super-2 number, since 2×261958403002² (a number of 24 digits) contains 22 as substring.

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, 2087124 + ... + 2209072.

Almost surely, 2^261958403002 is an apocalyptic number.

261958403002 is a deficient number, since it is larger than the sum of its proper divisors (136392247598).

261958403002 is a wasteful number, since it uses less digits than its factorization.

261958403002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136737.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 261958403002 in words is "two hundred sixty-one billion, nine hundred fifty-eight million, four hundred three thousand, two".