61819749828845 has 16 divisors (see below), whose sum is σ = 78558695976960. Its totient is φ = 46539969010944.

The previous prime is 61819749828841. The next prime is 61819749828883. The reversal of 61819749828845 is 54882894791816.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 61819749828845 - 2² = 61819749828841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61819749828845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61819749828841) 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, 51482285 + ... + 52669394.

It is an arithmetic number, because the mean of its divisors is an integer number (4909918498560).

Almost surely, 2^{61819749828845} is an apocalyptic number.

It is an amenable number.

61819749828845 is a deficient number, since it is larger than the sum of its proper divisors (16738946148115).

61819749828845 is a wasteful number, since it uses less digits than its factorization.

61819749828845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104158684.

The product of its digits is 2229534720, while the sum is 80.

The spelling of 61819749828845 in words is "sixty-one trillion, eight hundred nineteen billion, seven hundred forty-nine million, eight hundred twenty-eight thousand, eight hundred forty-five".