261544427231403 has 32 divisors (see below), whose sum is σ = 362134937894400. Its totient is φ = 167704611097856.

The previous prime is 261544427231341. The next prime is 261544427231443. The reversal of 261544427231403 is 304132724445162.

It is not a de Polignac number, because 261544427231403 - 2¹⁰ = 261544427230379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261544427231443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 732219376 + ... + 732576482.

It is an arithmetic number, because the mean of its divisors is an integer number (11316716809200).

Almost surely, 2^{261544427231403} is an apocalyptic number.

261544427231403 is a deficient number, since it is larger than the sum of its proper divisors (100590510662997).

261544427231403 is a wasteful number, since it uses less digits than its factorization.

261544427231403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389411.

The product of its (nonzero) digits is 3870720, while the sum is 48.

The spelling of 261544427231403 in words is "two hundred sixty-one trillion, five hundred forty-four billion, four hundred twenty-seven million, two hundred thirty-one thousand, four hundred three".