261715443873 has 16 divisors (see below), whose sum is σ = 375812209920. Its totient is φ = 161048939904.

The previous prime is 261715443809. The next prime is 261715443883. The reversal of 261715443873 is 378344517162.

It is not a de Polignac number, because 261715443873 - 2⁶ = 261715443809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261715443883) 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, 905965 + ... + 1159397.

It is an arithmetic number, because the mean of its divisors is an integer number (23488263120).

Almost surely, 2^261715443873 is an apocalyptic number.

It is an amenable number.

261715443873 is a deficient number, since it is larger than the sum of its proper divisors (114096766047).

261715443873 is a wasteful number, since it uses less digits than its factorization.

261715443873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279928.

The product of its digits is 3386880, while the sum is 51.

The spelling of 261715443873 in words is "two hundred sixty-one billion, seven hundred fifteen million, four hundred forty-three thousand, eight hundred seventy-three".