61027820513 has 6 divisors (see below), whose sum is σ = 67080166482. Its totient is φ = 55479836720.

The previous prime is 61027820509. The next prime is 61027820519. The reversal of 61027820513 is 31502872016.

It is a happy number.

61027820513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 60323289664 + 704530849 = 245608^2 + 26543^2 .

It is not a de Polignac number, because 61027820513 - 2² = 61027820509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61027820519) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 252180956 + ... + 252181197.

It is an arithmetic number, because the mean of its divisors is an integer number (11180027747).

Almost surely, 2^61027820513 is an apocalyptic number.

It is an amenable number.

61027820513 is a deficient number, since it is larger than the sum of its proper divisors (6052345969).

61027820513 is a wasteful number, since it uses less digits than its factorization.

61027820513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504362175 (or 504362164 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 61027820513 in words is "sixty-one billion, twenty-seven million, eight hundred twenty thousand, five hundred thirteen".