61513215601 has 8 divisors (see below), whose sum is σ = 61574660840. Its totient is φ = 61451799552.

The previous prime is 61513215583. The next prime is 61513215611. The reversal of 61513215601 is 10651231516.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 35269215601 + 26244000000 = 187801^2 + 162000^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61513215601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61513215611) 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, 8210065 + ... + 8217553.

It is an arithmetic number, because the mean of its divisors is an integer number (7696832605).

Almost surely, 2^61513215601 is an apocalyptic number.

It is an amenable number.

61513215601 is a deficient number, since it is larger than the sum of its proper divisors (61445239).

61513215601 is a wasteful number, since it uses less digits than its factorization.

61513215601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14595.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 61513215601 in words is "sixty-one billion, five hundred thirteen million, two hundred fifteen thousand, six hundred one".