261543073533202 has 4 divisors (see below), whose sum is σ = 392314610299806. Its totient is φ = 130771536766600.

The previous prime is 261543073533199. The next prime is 261543073533227. The reversal of 261543073533202 is 202335370345162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 249586630452721 + 11956443080481 = 15798311^2 + 3457809^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65385768383299 + ... + 65385768383302.

Almost surely, 2^{261543073533202} is an apocalyptic number.

261543073533202 is a deficient number, since it is larger than the sum of its proper divisors (130771536766604).

261543073533202 is a wasteful number, since it uses less digits than its factorization.

261543073533202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130771536766603.

The product of its (nonzero) digits is 2721600, while the sum is 46.

The spelling of 261543073533202 in words is "two hundred sixty-one trillion, five hundred forty-three billion, seventy-three million, five hundred thirty-three thousand, two hundred two".