61966791 has 6 divisors (see below), whose sum is σ = 89507600. Its totient is φ = 41311188.

The previous prime is 61966787. The next prime is 61966831. The reversal of 61966791 is 19766916.

It is not a de Polignac number, because 61966791 - 2² = 61966787 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 (61966711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3442591 + ... + 3442608.

Almost surely, 2^61966791 is an apocalyptic number.

61966791 is a deficient number, since it is larger than the sum of its proper divisors (27540809).

61966791 is a wasteful number, since it uses less digits than its factorization.

61966791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6885205 (or 6885202 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 61966791 is about 7871.8988179473. The cubic root of 61966791 is about 395.7184829591.

The spelling of 61966791 in words is "sixty-one million, nine hundred sixty-six thousand, seven hundred ninety-one".