61076620861 has 4 divisors (see below), whose sum is σ = 61215748000. Its totient is φ = 60937493724.

The previous prime is 61076620831. The next prime is 61076620897. The reversal of 61076620861 is 16802667016.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61076620861 - 2⁹ = 61076620349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61076620811) 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, 69562911 + ... + 69563788.

It is an arithmetic number, because the mean of its divisors is an integer number (15303937000).

Almost surely, 2^61076620861 is an apocalyptic number.

It is an amenable number.

61076620861 is a deficient number, since it is larger than the sum of its proper divisors (139127139).

61076620861 is a wasteful number, since it uses less digits than its factorization.

61076620861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139127138.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 61076620861 in words is "sixty-one billion, seventy-six million, six hundred twenty thousand, eight hundred sixty-one".