661241665544115 has 64 divisors (see below), whose sum is σ = 1088567527680000. Its totient is φ = 342602934695424.

The previous prime is 661241665544113. The next prime is 661241665544203. The reversal of 661241665544115 is 511445566142166.

It is not a de Polignac number, because 661241665544115 - 2¹ = 661241665544113 is a prime.

It is a super-2 number, since 2×661241665544115² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661241665544111) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 168100621 + ... + 171989249.

It is an arithmetic number, because the mean of its divisors is an integer number (17008867620000).

Almost surely, 2^{661241665544115} is an apocalyptic number.

661241665544115 is a deficient number, since it is larger than the sum of its proper divisors (427325862135885).

661241665544115 is a wasteful number, since it uses less digits than its factorization.

661241665544115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3890796.

The product of its digits is 20736000, while the sum is 57.

The spelling of 661241665544115 in words is "six hundred sixty-one trillion, two hundred forty-one billion, six hundred sixty-five million, five hundred forty-four thousand, one hundred fifteen".