661183254 has 48 divisors (see below), whose sum is σ = 1497809664. Its totient is φ = 210394800.

The previous prime is 661183207. The next prime is 661183301. The reversal of 661183254 is 452381166.

It is a happy number.

661183254 is a `hidden beast` number, since 6 + 611 + 8 + 32 + 5 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (661183207) and next prime (661183301).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 259969 + ... + 262499.

It is an arithmetic number, because the mean of its divisors is an integer number (31204368).

Almost surely, 2^661183254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661183254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (748904832).

661183254 is an abundant number, since it is smaller than the sum of its proper divisors (836626410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661183254 is a wasteful number, since it uses less digits than its factorization.

661183254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3193 (or 3190 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 661183254 is about 25713.4838946417. The cubic root of 661183254 is about 871.1787668076.

The spelling of 661183254 in words is "six hundred sixty-one million, one hundred eighty-three thousand, two hundred fifty-four".