661124113 has 6 divisors (see below), whose sum is σ = 715891974. Its totient is φ = 610268256.

The previous prime is 661124089. The next prime is 661124159. The reversal of 661124113 is 311421166.

It can be written as a sum of positive squares in 3 ways, for example, as 47224384 + 613899729 = 6872^2 + 24777^2 .

It is not a de Polignac number, because 661124113 - 2¹³ = 661115921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661122113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1955820 + ... + 1956157.

It is an arithmetic number, because the mean of its divisors is an integer number (119315329).

Almost surely, 2^661124113 is an apocalyptic number.

It is an amenable number.

661124113 is a deficient number, since it is larger than the sum of its proper divisors (54767861).

661124113 is a wasteful number, since it uses less digits than its factorization.

661124113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912003 (or 3911990 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 661124113 is about 25712.3338691765. Note that the first 3 decimals coincide. The cubic root of 661124113 is about 871.1527911953.

Adding to 661124113 its reverse (311421166), we get a palindrome (972545279).

It can be divided in two parts, 66112 and 4113, that added together give a square (70225 = 265²).

The spelling of 661124113 in words is "six hundred sixty-one million, one hundred twenty-four thousand, one hundred thirteen".