561628543738 has 16 divisors (see below), whose sum is σ = 870372723456. Its totient is φ = 271520017920.

The previous prime is 561628543717. The next prime is 561628543759. The reversal of 561628543738 is 837345826165.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (561628543717) and next prime (561628543759).

It is a super-2 number, since 2×561628543738² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3856756 + ... + 3999727.

It is an arithmetic number, because the mean of its divisors is an integer number (54398295216).

Almost surely, 2^561628543738 is an apocalyptic number.

561628543738 is a deficient number, since it is larger than the sum of its proper divisors (308744179718).

561628543738 is a wasteful number, since it uses less digits than its factorization.

561628543738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7857669.

The product of its digits is 29030400, while the sum is 58.

The spelling of 561628543738 in words is "five hundred sixty-one billion, six hundred twenty-eight million, five hundred forty-three thousand, seven hundred thirty-eight".