61380820445455 has 16 divisors (see below), whose sum is σ = 84276953708544. Its totient is φ = 42040934042400.

The previous prime is 61380820445449. The next prime is 61380820445471. The reversal of 61380820445455 is 55454402808316.

It is a happy number.

It is not a de Polignac number, because 61380820445455 - 2⁹ = 61380820444943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61380820445396 and 61380820445405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1016040321 + ... + 1016100730.

It is an arithmetic number, because the mean of its divisors is an integer number (5267309606784).

Almost surely, 2^{61380820445455} is an apocalyptic number.

61380820445455 is a deficient number, since it is larger than the sum of its proper divisors (22896133263089).

61380820445455 is a wasteful number, since it uses less digits than its factorization.

61380820445455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032141926.

The product of its (nonzero) digits is 18432000, while the sum is 55.

The spelling of 61380820445455 in words is "sixty-one trillion, three hundred eighty billion, eight hundred twenty million, four hundred forty-five thousand, four hundred fifty-five".