661160051005 has 4 divisors (see below), whose sum is σ = 793392061212. Its totient is φ = 528928040800.

The previous prime is 661160050997. The next prime is 661160051009. The reversal of 661160051005 is 500150061166.

661160051005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 80557198276 + 580602852729 = 283826^2 + 761973^2 .

It is not a de Polignac number, because 661160051005 - 2³ = 661160050997 is a prime.

It is a super-2 number, since 2×661160051005² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661160051009) 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, 66116005096 + ... + 66116005105.

It is an arithmetic number, because the mean of its divisors is an integer number (198348015303).

Almost surely, 2^661160051005 is an apocalyptic number.

It is an amenable number.

661160051005 is a deficient number, since it is larger than the sum of its proper divisors (132232010207).

661160051005 is a wasteful number, since it uses less digits than its factorization.

661160051005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132232010206.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 661160051005 in words is "six hundred sixty-one billion, one hundred sixty million, fifty-one thousand, five".