61651116205570 has 16 divisors (see below), whose sum is σ = 111043465739640. Its totient is φ = 24644567244544.

The previous prime is 61651116205559. The next prime is 61651116205571. The reversal of 61651116205570 is 7550261115616.

It can be written as a sum of positive squares in 4 ways, for example, as 24700194265041 + 36950921940529 = 4969929^2 + 6078727^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61651116205570.

It is not an unprimeable number, because it can be changed into a prime (61651116205571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1984888405 + ... + 1984919464.

Almost surely, 2^{61651116205570} is an apocalyptic number.

61651116205570 is a deficient number, since it is larger than the sum of its proper divisors (49392349534070).

61651116205570 is a wasteful number, since it uses less digits than its factorization.

61651116205570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3969809429.

The product of its (nonzero) digits is 378000, while the sum is 46.

The spelling of 61651116205570 in words is "sixty-one trillion, six hundred fifty-one billion, one hundred sixteen million, two hundred five thousand, five hundred seventy".