261026062500 has 252 divisors, whose sum is σ = 885643976112. Its totient is φ = 59661000000.

The previous prime is 261026062483. The next prime is 261026062511. The reversal of 261026062500 is 5260620162.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 9173295 + ... + 9201705.

Almost surely, 2^261026062500 is an apocalyptic number.

261026062500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261026062500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (442821988056).

261026062500 is an abundant number, since it is smaller than the sum of its proper divisors (624617913612).

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

261026062500 is an equidigital number, since it uses as much as digits as its factorization.

261026062500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28462 (or 28428 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 261026062500 its reverse (5260620162), we get a palindrome (266286682662).

The spelling of 261026062500 in words is "two hundred sixty-one billion, twenty-six million, sixty-two thousand, five hundred".