261694546153394 has 8 divisors (see below), whose sum is σ = 392541990510828. Its totient is φ = 130847215983120.

The previous prime is 261694546153387. The next prime is 261694546153471. The reversal of 261694546153394 is 493351645496162.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 241736106058225 + 19958440095169 = 15547865^2 + 4467487^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22566737 + ... + 32134820.

Almost surely, 2^{261694546153394} is an apocalyptic number.

261694546153394 is a deficient number, since it is larger than the sum of its proper divisors (130847444357434).

261694546153394 is a wasteful number, since it uses less digits than its factorization.

261694546153394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57093580.

The product of its digits is 503884800, while the sum is 68.

The spelling of 261694546153394 in words is "two hundred sixty-one trillion, six hundred ninety-four billion, five hundred forty-six million, one hundred fifty-three thousand, three hundred ninety-four".