261563451574662 has 48 divisors (see below), whose sum is σ = 618642601536960. Its totient is φ = 82598984704872.

The previous prime is 261563451574657. The next prime is 261563451574693. The reversal of 261563451574662 is 266475154365162.

It is a happy number.

261563451574662 is a `hidden beast` number, since 2 + 6 + 1 + 5 + 6 + 3 + 4 + 51 + 574 + 6 + 6 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 261563451574662.

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, 14163053988 + ... + 14163072455.

It is an arithmetic number, because the mean of its divisors is an integer number (12888387532020).

Almost surely, 2^{261563451574662} is an apocalyptic number.

261563451574662 is an abundant number, since it is smaller than the sum of its proper divisors (357079149962298).

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

261563451574662 is a wasteful number, since it uses less digits than its factorization.

261563451574662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28326126479 (or 28326126467 counting only the distinct ones).

The product of its digits is 217728000, while the sum is 63.

The spelling of 261563451574662 in words is "two hundred sixty-one trillion, five hundred sixty-three billion, four hundred fifty-one million, five hundred seventy-four thousand, six hundred sixty-two".