61071986791 has 8 divisors (see below), whose sum is σ = 63194828400. Its totient is φ = 58950272640.

The previous prime is 61071986783. The next prime is 61071986827. The reversal of 61071986791 is 19768917016.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61071986791 - 2³ = 61071986783 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 (61071986491) 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, 170901 + ... + 389038.

It is an arithmetic number, because the mean of its divisors is an integer number (7899353550).

Almost surely, 2^61071986791 is an apocalyptic number.

61071986791 is a deficient number, since it is larger than the sum of its proper divisors (2122841609).

61071986791 is a wasteful number, since it uses less digits than its factorization.

61071986791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563729.

The product of its (nonzero) digits is 1143072, while the sum is 55.

The spelling of 61071986791 in words is "sixty-one billion, seventy-one million, nine hundred eighty-six thousand, seven hundred ninety-one".