261602770556502 has 48 divisors (see below), whose sum is σ = 570271088808720. Its totient is φ = 86669417601216.

The previous prime is 261602770556483. The next prime is 261602770556579. The reversal of 261602770556502 is 205655077206162.

261602770556502 is a `hidden beast` number, since 2 + 6 + 1 + 6 + 0 + 2 + 7 + 70 + 5 + 565 + 0 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64027533 + ... + 67990664.

It is an arithmetic number, because the mean of its divisors is an integer number (11880647683515).

Almost surely, 2^{261602770556502} is an apocalyptic number.

261602770556502 is an abundant number, since it is smaller than the sum of its proper divisors (308668318252218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261602770556502 is a wasteful number, since it uses less digits than its factorization.

261602770556502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132018877 (or 132018874 counting only the distinct ones).

The product of its (nonzero) digits is 10584000, while the sum is 54.

The spelling of 261602770556502 in words is "two hundred sixty-one trillion, six hundred two billion, seven hundred seventy million, five hundred fifty-six thousand, five hundred two".