61260718521 has 16 divisors (see below), whose sum is σ = 83599110144. Its totient is φ = 39885158544.

The previous prime is 61260718487. The next prime is 61260718531. The reversal of 61260718521 is 12581706216.

61260718521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61260718521 - 2¹⁵ = 61260685753 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61260718521.

It is not an unprimeable number, because it can be changed into a prime (61260718531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403911 + ... + 534476.

It is an arithmetic number, because the mean of its divisors is an integer number (5224944384).

Almost surely, 2^61260718521 is an apocalyptic number.

It is an amenable number.

61260718521 is a deficient number, since it is larger than the sum of its proper divisors (22338391623).

61260718521 is a wasteful number, since it uses less digits than its factorization.

61260718521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938900.

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 61260718521 in words is "sixty-one billion, two hundred sixty million, seven hundred eighteen thousand, five hundred twenty-one".