1015261055617 has 4 divisors (see below), whose sum is σ = 1015340206420. Its totient is φ = 1015181904816.

The previous prime is 1015261055461. The next prime is 1015261055629. The reversal of 1015261055617 is 7165501625101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 721235753536 + 294025302081 = 849256^2 + 542241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1015261055617 is a prime.

It is a super-2 number, since 2×1015261055617² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1015261055617.

It is not an unprimeable number, because it can be changed into a prime (1015261055647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39556158 + ... + 39581815.

It is an arithmetic number, because the mean of its divisors is an integer number (253835051605).

Almost surely, 2^{1015261055617} is an apocalyptic number.

It is an amenable number.

1015261055617 is a deficient number, since it is larger than the sum of its proper divisors (79150803).

1015261055617 is an equidigital number, since it uses as much as digits as its factorization.

1015261055617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79150802.

The product of its (nonzero) digits is 63000, while the sum is 40.

The spelling of 1015261055617 in words is "one trillion, fifteen billion, two hundred sixty-one million, fifty-five thousand, six hundred seventeen".