561523984250 has 32 divisors (see below), whose sum is σ = 1062983872080. Its totient is φ = 222085881600.

The previous prime is 561523984249. The next prime is 561523984267. The reversal of 561523984250 is 52489325165.

It can be written as a sum of positive squares in 8 ways, for example, as 47261455609 + 514262528641 = 217397^2 + 717121^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12596267 + ... + 12640766.

Almost surely, 2^561523984250 is an apocalyptic number.

561523984250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

561523984250 is a deficient number, since it is larger than the sum of its proper divisors (501459887830).

561523984250 is a wasteful number, since it uses less digits than its factorization.

561523984250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25237139 (or 25237129 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 561523984250 in words is "five hundred sixty-one billion, five hundred twenty-three million, nine hundred eighty-four thousand, two hundred fifty".