261762742124742 has 48 divisors (see below), whose sum is σ = 552533682443760. Its totient is φ = 82661317712064.

The previous prime is 261762742124717. The next prime is 261762742124827. The reversal of 261762742124742 is 247421247267162.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 369540484 + ... + 370248152.

It is an arithmetic number, because the mean of its divisors is an integer number (11511118384245).

Almost surely, 2^{261762742124742} is an apocalyptic number.

261762742124742 is an abundant number, since it is smaller than the sum of its proper divisors (290770940319018).

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

261762742124742 is a wasteful number, since it uses less digits than its factorization.

261762742124742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878485 (or 878466 counting only the distinct ones).

The product of its digits is 25288704, while the sum is 57.

The spelling of 261762742124742 in words is "two hundred sixty-one trillion, seven hundred sixty-two billion, seven hundred forty-two million, one hundred twenty-four thousand, seven hundred forty-two".