1015261061550 has 96 divisors (see below), whose sum is σ = 2589464596992. Its totient is φ = 263055703680.

The previous prime is 1015261061501. The next prime is 1015261061569. The reversal of 1015261061550 is 551601625101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3909039 + ... + 4160661.

It is an arithmetic number, because the mean of its divisors is an integer number (26973589552).

Almost surely, 2^{1015261061550} is an apocalyptic number.

1015261061550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1015261061550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1294732298496).

1015261061550 is an abundant number, since it is smaller than the sum of its proper divisors (1574203535442).

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

1015261061550 is a wasteful number, since it uses less digits than its factorization.

1015261061550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252402 (or 252397 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 33.

Adding to 1015261061550 its reverse (551601625101), we get a palindrome (1566862686651).

The spelling of 1015261061550 in words is "one trillion, fifteen billion, two hundred sixty-one million, sixty-one thousand, five hundred fifty".