261665713536616 has 64 divisors (see below), whose sum is σ = 504474743424960. Its totient is φ = 127196908800000.

The previous prime is 261665713536581. The next prime is 261665713536631. The reversal of 261665713536616 is 616635317566162.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7892280 + ... + 24199576.

It is an arithmetic number, because the mean of its divisors is an integer number (7882417866015).

Almost surely, 2^{261665713536616} is an apocalyptic number.

It is an amenable number.

261665713536616 is a deficient number, since it is larger than the sum of its proper divisors (242809029888344).

261665713536616 is a wasteful number, since it uses less digits than its factorization.

261665713536616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16307746 (or 16307742 counting only the distinct ones).

The product of its digits is 146966400, while the sum is 64.

The spelling of 261665713536616 in words is "two hundred sixty-one trillion, six hundred sixty-five billion, seven hundred thirteen million, five hundred thirty-six thousand, six hundred sixteen".