561301650 has 240 divisors, whose sum is σ = 1920752064. Its totient is φ = 118350720.

The previous prime is 561301649. The next prime is 561301651. The reversal of 561301650 is 56103165.

It is a happy number.

561301650 is a `hidden beast` number, since 5 + 6 + 1 + 3 + 0 + 1 + 650 = 666.

It is an interprime number because it is at equal distance from previous prime (561301649) and next prime (561301651).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (561301651) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 367789 + ... + 369311.

Almost surely, 2^561301650 is an apocalyptic number.

561301650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 561301650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (960376032).

561301650 is an abundant number, since it is smaller than the sum of its proper divisors (1359450414).

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

561301650 is a wasteful number, since it uses less digits than its factorization.

561301650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567 (or 1553 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 561301650 is about 23691.8055453779. The cubic root of 561301650 is about 824.8951932977.

The spelling of 561301650 in words is "five hundred sixty-one million, three hundred one thousand, six hundred fifty".