261430536316020 has 24 divisors (see below), whose sum is σ = 732005501685024. Its totient is φ = 69714809684256.

The previous prime is 261430536315953. The next prime is 261430536316043. The reversal of 261430536316020 is 20613635034162.

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 7 ways as a sum of consecutive naturals, for example, 2178587802574 + ... + 2178587802693.

It is an arithmetic number, because the mean of its divisors is an integer number (30500229236876).

Almost surely, 2^{261430536316020} is an apocalyptic number.

261430536316020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261430536316020 is an abundant number, since it is smaller than the sum of its proper divisors (470574965369004).

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

261430536316020 is a wasteful number, since it uses less digits than its factorization.

261430536316020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4357175605279 (or 4357175605277 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 261430536316020 in words is "two hundred sixty-one trillion, four hundred thirty billion, five hundred thirty-six million, three hundred sixteen thousand, twenty".