261432140477671 has 16 divisors (see below), whose sum is σ = 273378992198400. Its totient is φ = 249534051540928.

The previous prime is 261432140477663. The next prime is 261432140477693. The reversal of 261432140477671 is 176774041234162.

It is not a de Polignac number, because 261432140477671 - 2³ = 261432140477663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261432140477171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23429520 + ... + 32738458.

It is an arithmetic number, because the mean of its divisors is an integer number (17086187012400).

Almost surely, 2^{261432140477671} is an apocalyptic number.

261432140477671 is a deficient number, since it is larger than the sum of its proper divisors (11946851720729).

261432140477671 is a wasteful number, since it uses less digits than its factorization.

261432140477671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9311558.

The product of its (nonzero) digits is 9483264, while the sum is 55.

The spelling of 261432140477671 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, one hundred forty million, four hundred seventy-seven thousand, six hundred seventy-one".