61561661015000 has 80 divisors (see below), whose sum is σ = 144532743248520. Its totient is φ = 24574511360000.

The previous prime is 61561661014949. The next prime is 61561661015027. The reversal of 61561661015000 is 51016616516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10083017 + ... + 14993016.

Almost surely, 2^{61561661015000} is an apocalyptic number.

It is an amenable number.

61561661015000 is an abundant number, since it is smaller than the sum of its proper divisors (82971082233520).

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

61561661015000 is a wasteful number, since it uses less digits than its factorization.

61561661015000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25076550 (or 25076531 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 61561661015000 in words is "sixty-one trillion, five hundred sixty-one billion, six hundred sixty-one million, fifteen thousand".