261101027500 has 30 divisors (see below), whose sum is σ = 570975732404. Its totient is φ = 104440410000.

The previous prime is 261101027497. The next prime is 261101027597. The reversal of 261101027500 is 5720101162.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 52217706 + ... + 52222705.

Almost surely, 2^261101027500 is an apocalyptic number.

261101027500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261101027500 is an abundant number, since it is smaller than the sum of its proper divisors (309874704904).

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

261101027500 is a wasteful number, since it uses less digits than its factorization.

261101027500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104440435 (or 104440418 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

Adding to 261101027500 its reverse (5720101162), we get a palindrome (266821128662).

The spelling of 261101027500 in words is "two hundred sixty-one billion, one hundred one million, twenty-seven thousand, five hundred".