261535126603356 has 72 divisors (see below), whose sum is σ = 674083916460864. Its totient is φ = 85469043404160.

The previous prime is 261535126603279. The next prime is 261535126603459. The reversal of 261535126603356 is 653306621535162.

261535126603356 is a `hidden beast` number, since 2 + 6 + 1 + 5 + 3 + 5 + 1 + 26 + 603 + 3 + 5 + 6 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

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, 49115755 + ... + 54179586.

It is an arithmetic number, because the mean of its divisors is an integer number (9362276617512).

Almost surely, 2^{261535126603356} is an apocalyptic number.

It is an amenable number.

261535126603356 is an abundant number, since it is smaller than the sum of its proper divisors (412548789857508).

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

261535126603356 is a wasteful number, since it uses less digits than its factorization.

261535126603356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103296731 (or 103296726 counting only the distinct ones).

The product of its (nonzero) digits is 17496000, while the sum is 54.

The spelling of 261535126603356 in words is "two hundred sixty-one trillion, five hundred thirty-five billion, one hundred twenty-six million, six hundred three thousand, three hundred fifty-six".