61845454815 has 16 divisors (see below), whose sum is σ = 100574905056. Its totient is φ = 32443516800.

The previous prime is 61845454799. The next prime is 61845454817. The reversal of 61845454815 is 51845454816.

It is not a de Polignac number, because 61845454815 - 2⁴ = 61845454799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61845454817) 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, 33794416 + ... + 33796245.

It is an arithmetic number, because the mean of its divisors is an integer number (6285931566).

Almost surely, 2^61845454815 is an apocalyptic number.

61845454815 is a deficient number, since it is larger than the sum of its proper divisors (38729450241).

61845454815 is a wasteful number, since it uses less digits than its factorization.

61845454815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67590730.

The product of its digits is 3072000, while the sum is 51.

Subtracting from 61845454815 its reverse (51845454816), we obtain a palindrome (9999999999).

The spelling of 61845454815 in words is "sixty-one billion, eight hundred forty-five million, four hundred fifty-four thousand, eight hundred fifteen".