261355825288 has 32 divisors (see below), whose sum is σ = 516138343200. Its totient is φ = 123727053312.

The previous prime is 261355825279. The next prime is 261355825321. The reversal of 261355825288 is 882528553162.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

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, 248670 + ... + 764557.

It is an arithmetic number, because the mean of its divisors is an integer number (16129323225).

Almost surely, 2^261355825288 is an apocalyptic number.

It is an amenable number.

261355825288 is a deficient number, since it is larger than the sum of its proper divisors (254782517912).

261355825288 is a wasteful number, since it uses less digits than its factorization.

261355825288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014949 (or 1014945 counting only the distinct ones).

The product of its digits is 9216000, while the sum is 55.

The spelling of 261355825288 in words is "two hundred sixty-one billion, three hundred fifty-five million, eight hundred twenty-five thousand, two hundred eighty-eight".