61520205455 has 48 divisors (see below), whose sum is σ = 81267979104. Its totient is φ = 44551127040.

The previous prime is 61520205419. The next prime is 61520205463. The reversal of 61520205455 is 55450202516.

It is not a de Polignac number, because 61520205455 - 2¹⁸ = 61519943311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20228735 + ... + 20231775.

It is an arithmetic number, because the mean of its divisors is an integer number (1693082898).

Almost surely, 2^61520205455 is an apocalyptic number.

61520205455 is a deficient number, since it is larger than the sum of its proper divisors (19747773649).

61520205455 is a wasteful number, since it uses less digits than its factorization.

61520205455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3404 (or 3375 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

The spelling of 61520205455 in words is "sixty-one billion, five hundred twenty million, two hundred five thousand, four hundred fifty-five".