61206640111 has 4 divisors (see below), whose sum is σ = 61209415800. Its totient is φ = 61203864424.

The previous prime is 61206640087. The next prime is 61206640177. The reversal of 61206640111 is 11104660216.

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 61206640111 - 2²³ = 61198251503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61206640111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61206640211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1354501 + ... + 1398958.

It is an arithmetic number, because the mean of its divisors is an integer number (15302353950).

Almost surely, 2^61206640111 is an apocalyptic number.

61206640111 is a deficient number, since it is larger than the sum of its proper divisors (2775689).

61206640111 is a wasteful number, since it uses less digits than its factorization.

61206640111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775688.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 61206640111 in words is "sixty-one billion, two hundred six million, six hundred forty thousand, one hundred eleven".