61878813653 has 16 divisors (see below), whose sum is σ = 65736551424. Its totient is φ = 58144106880.

The previous prime is 61878813589. The next prime is 61878813779. The reversal of 61878813653 is 35631887816.

61878813653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61878813653 - 2⁶ = 61878813589 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61878813053) 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, 503201 + ... + 613977.

It is an arithmetic number, because the mean of its divisors is an integer number (4108534464).

Almost surely, 2^61878813653 is an apocalyptic number.

It is an amenable number.

61878813653 is a deficient number, since it is larger than the sum of its proper divisors (3857737771).

61878813653 is a wasteful number, since it uses less digits than its factorization.

61878813653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111332.

The product of its digits is 5806080, while the sum is 56.

The spelling of 61878813653 in words is "sixty-one billion, eight hundred seventy-eight million, eight hundred thirteen thousand, six hundred fifty-three".