61836667578 has 96 divisors (see below), whose sum is σ = 167717122560. Its totient is φ = 16054940160.

The previous prime is 61836667573. The next prime is 61836667583. The reversal of 61836667578 is 87576663816.

61836667578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61836667573) and next prime (61836667583).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (61836667573) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 435618 + ... + 559853.

It is an arithmetic number, because the mean of its divisors is an integer number (1747053360).

Almost surely, 2^61836667578 is an apocalyptic number.

61836667578 is an abundant number, since it is smaller than the sum of its proper divisors (105880454982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61836667578 is a wasteful number, since it uses less digits than its factorization.

61836667578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995532 (or 995529 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 63.

The spelling of 61836667578 in words is "sixty-one billion, eight hundred thirty-six million, six hundred sixty-seven thousand, five hundred seventy-eight".