61666062443 has 4 divisors (see below), whose sum is σ = 62109703320. Its totient is φ = 61222421568.

The previous prime is 61666062371. The next prime is 61666062467. The reversal of 61666062443 is 34426066616.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61666062443 - 2¹⁶ = 61665996907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61666062394 and 61666062403.

It is not an unprimeable number, because it can be changed into a prime (61666062043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221820230 + ... + 221820507.

It is an arithmetic number, because the mean of its divisors is an integer number (15527425830).

Almost surely, 2^61666062443 is an apocalyptic number.

61666062443 is a deficient number, since it is larger than the sum of its proper divisors (443640877).

61666062443 is a wasteful number, since it uses less digits than its factorization.

61666062443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443640876.

The product of its (nonzero) digits is 746496, while the sum is 44.

The spelling of 61666062443 in words is "sixty-one billion, six hundred sixty-six million, sixty-two thousand, four hundred forty-three".