261077180240 has 20 divisors (see below), whose sum is σ = 607004444244. Its totient is φ = 104430872064.

The previous prime is 261077180239. The next prime is 261077180251. The reversal of 261077180240 is 42081770162.

It can be written as a sum of positive squares in 2 ways, for example, as 42375045904 + 218702134336 = 205852^2 + 467656^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×261077180240² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261077180194 and 261077180203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1631732297 + ... + 1631732456.

Almost surely, 2^261077180240 is an apocalyptic number.

261077180240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261077180240 is an abundant number, since it is smaller than the sum of its proper divisors (345927264004).

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

261077180240 is a wasteful number, since it uses less digits than its factorization.

261077180240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3263464766 (or 3263464760 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The spelling of 261077180240 in words is "two hundred sixty-one billion, seventy-seven million, one hundred eighty thousand, two hundred forty".