261430786183 has 32 divisors (see below), whose sum is σ = 318258201600. Its totient is φ = 214255087200.

The previous prime is 261430786181. The next prime is 261430786189. The reversal of 261430786183 is 381687034162.

It is not a de Polignac number, because 261430786183 - 2¹ = 261430786181 is a prime.

It is a super-2 number, since 2×261430786183² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261430786181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26399533 + ... + 26409433.

It is an arithmetic number, because the mean of its divisors is an integer number (9945568800).

Almost surely, 2^261430786183 is an apocalyptic number.

261430786183 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

261430786183 is a deficient number, since it is larger than the sum of its proper divisors (56827415417).

261430786183 is an equidigital number, since it uses as much as digits as its factorization.

261430786183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13292 (or 13278 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 261430786183 in words is "two hundred sixty-one billion, four hundred thirty million, seven hundred eighty-six thousand, one hundred eighty-three".