261543024237144 has 32 divisors (see below), whose sum is σ = 704154296023920. Its totient is φ = 80474776688256.

The previous prime is 261543024237139. The next prime is 261543024237167. The reversal of 261543024237144 is 441732420345162.

It is a super-2 number, since 2×261543024237144² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261543024237093 and 261543024237102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419139461607 + ... + 419139462230.

Almost surely, 2^{261543024237144} is an apocalyptic number.

261543024237144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261543024237144 is an abundant number, since it is smaller than the sum of its proper divisors (442611271786776).

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

261543024237144 is a wasteful number, since it uses less digits than its factorization.

261543024237144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838278923859 (or 838278923855 counting only the distinct ones).

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

The spelling of 261543024237144 in words is "two hundred sixty-one trillion, five hundred forty-three billion, twenty-four million, two hundred thirty-seven thousand, one hundred forty-four".