261553320554532 has 24 divisors (see below), whose sum is σ = 626785434843456. Its totient is φ = 84828103963488.

The previous prime is 261553320554479. The next prime is 261553320554549. The reversal of 261553320554532 is 235455023355162.

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, 294542027208 + ... + 294542028095.

It is an arithmetic number, because the mean of its divisors is an integer number (26116059785144).

Almost surely, 2^{261553320554532} is an apocalyptic number.

It is an amenable number.

261553320554532 is an abundant number, since it is smaller than the sum of its proper divisors (365232114288924).

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

261553320554532 is a wasteful number, since it uses less digits than its factorization.

261553320554532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589084055347 (or 589084055345 counting only the distinct ones).

The product of its (nonzero) digits is 16200000, while the sum is 51.

The spelling of 261553320554532 in words is "two hundred sixty-one trillion, five hundred fifty-three billion, three hundred twenty million, five hundred fifty-four thousand, five hundred thirty-two".