11445661561015 has 32 divisors (see below), whose sum is σ = 15487849654272. Its totient is φ = 8044606800000.

The previous prime is 11445661561001. The next prime is 11445661561021. The reversal of 11445661561015 is 51016516654411.

It is not a de Polignac number, because 11445661561015 - 2¹⁵ = 11445661528247 is a prime.

It is a super-3 number, since 3×11445661561015³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3329361 + ... + 5828890.

It is an arithmetic number, because the mean of its divisors is an integer number (483995301696).

Almost surely, 2^{11445661561015} is an apocalyptic number.

11445661561015 is a deficient number, since it is larger than the sum of its proper divisors (4042188093257).

11445661561015 is a wasteful number, since it uses less digits than its factorization.

11445661561015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9159031.

The product of its (nonzero) digits is 432000, while the sum is 46.

The spelling of 11445661561015 in words is "eleven trillion, four hundred forty-five billion, six hundred sixty-one million, five hundred sixty-one thousand, fifteen".