61663602100 has 36 divisors (see below), whose sum is σ = 133888141548. Its totient is φ = 24651040000.

The previous prime is 61663602067. The next prime is 61663602101. The reversal of 61663602100 is 120636616.

It can be written as a sum of positive squares in 6 ways, for example, as 2569881636 + 59093720464 = 50694^2 + 243092^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61663602101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7051 + ... + 351250.

It is an arithmetic number, because the mean of its divisors is an integer number (3719115043).

Almost surely, 2^61663602100 is an apocalyptic number.

It is an amenable number.

61663602100 is an abundant number, since it is smaller than the sum of its proper divisors (72224539448).

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

61663602100 is a wasteful number, since it uses less digits than its factorization.

61663602100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360036 (or 360029 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 61663602100 in words is "sixty-one billion, six hundred sixty-three million, six hundred two thousand, one hundred".