61809838485 has 16 divisors (see below), whose sum is σ = 98972022336. Its totient is φ = 32939820288.

The previous prime is 61809838459. The next prime is 61809838567. The reversal of 61809838485 is 58483890816.

It is not a de Polignac number, because 61809838485 - 2⁶ = 61809838421 is a prime.

It is a super-2 number, since 2×61809838485² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1569079 + ... + 1607988.

It is an arithmetic number, because the mean of its divisors is an integer number (6185751396).

Almost surely, 2^61809838485 is an apocalyptic number.

It is an amenable number.

61809838485 is a deficient number, since it is larger than the sum of its proper divisors (37162183851).

61809838485 is a wasteful number, since it uses less digits than its factorization.

61809838485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3178372.

The product of its (nonzero) digits is 13271040, while the sum is 60.

The spelling of 61809838485 in words is "sixty-one billion, eight hundred nine million, eight hundred thirty-eight thousand, four hundred eighty-five".