61265215650 has 96 divisors (see below), whose sum is σ = 153474552000. Its totient is φ = 16172513280.

The previous prime is 61265215619. The next prime is 61265215679. The reversal of 61265215650 is 5651256216.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 61265215599 and 61265215608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17507601 + ... + 17511099.

It is an arithmetic number, because the mean of its divisors is an integer number (1598693250).

Almost surely, 2^61265215650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61265215650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76737276000).

61265215650 is an abundant number, since it is smaller than the sum of its proper divisors (92209336350).

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

61265215650 is a wasteful number, since it uses less digits than its factorization.

61265215650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4660 (or 4655 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 61265215650 in words is "sixty-one billion, two hundred sixty-five million, two hundred fifteen thousand, six hundred fifty".