561731658490 has 16 divisors (see below), whose sum is σ = 1011126019752. Its totient is φ = 224690655744.

The previous prime is 561731658473. The next prime is 561731658491. The reversal of 561731658490 is 94856137165.

It can be written as a sum of positive squares in 4 ways, for example, as 511552522441 + 50179136049 = 715229^2 + 224007^2 .

It is a super-2 number, since 2×561731658490² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (561731658491) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1517842 + ... + 1851298.

Almost surely, 2^561731658490 is an apocalyptic number.

561731658490 is a deficient number, since it is larger than the sum of its proper divisors (449394361262).

561731658490 is a wasteful number, since it uses less digits than its factorization.

561731658490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501921.

The product of its (nonzero) digits is 5443200, while the sum is 55.

It can be divided in two parts, 561731 and 658490, that added together give a palindrome (1220221).

The spelling of 561731658490 in words is "five hundred sixty-one billion, seven hundred thirty-one million, six hundred fifty-eight thousand, four hundred ninety".