61667838566 has 16 divisors (see below), whose sum is σ = 97444848960. Its totient is φ = 29188708200.

The previous prime is 61667838523. The next prime is 61667838569. The reversal of 61667838566 is 66583876616.

It is a happy number.

61667838566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 61667838499 and 61667838508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61667838569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571160 + ... + 670491.

It is an arithmetic number, because the mean of its divisors is an integer number (6090303060).

Almost surely, 2^61667838566 is an apocalyptic number.

61667838566 is a deficient number, since it is larger than the sum of its proper divisors (35777010394).

61667838566 is a wasteful number, since it uses less digits than its factorization.

61667838566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242979.

The product of its digits is 52254720, while the sum is 62.

The spelling of 61667838566 in words is "sixty-one billion, six hundred sixty-seven million, eight hundred thirty-eight thousand, five hundred sixty-six".