661227615105 has 32 divisors (see below), whose sum is σ = 1158824880000. Its totient is φ = 320465144832.

The previous prime is 661227615053. The next prime is 661227615107. The reversal of 661227615105 is 501516722166.

661227615105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661227615105 - 2¹⁰ = 661227614081 is a prime.

It is a super-2 number, since 2×661227615105² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661227615107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44700355 + ... + 44715144.

It is an arithmetic number, because the mean of its divisors is an integer number (36213277500).

Almost surely, 2^661227615105 is an apocalyptic number.

It is an amenable number.

661227615105 is a deficient number, since it is larger than the sum of its proper divisors (497597264895).

661227615105 is a wasteful number, since it uses less digits than its factorization.

661227615105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89415553.

The product of its (nonzero) digits is 151200, while the sum is 42.

The spelling of 661227615105 in words is "six hundred sixty-one billion, two hundred twenty-seven million, six hundred fifteen thousand, one hundred five".