61745392391 has 8 divisors (see below), whose sum is σ = 63064473600. Its totient is φ = 60426534168.

The previous prime is 61745392349. The next prime is 61745392433. The reversal of 61745392391 is 19329354716.

It is an interprime number because it is at equal distance from previous prime (61745392349) and next prime (61745392433).

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 61745392391 - 2⁶ = 61745392327 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 (61745392321) 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 7 ways as a sum of consecutive naturals, for example, 580730 + ... + 678776.

It is an arithmetic number, because the mean of its divisors is an integer number (7883059200).

Almost surely, 2^61745392391 is an apocalyptic number.

61745392391 is a deficient number, since it is larger than the sum of its proper divisors (1319081209).

61745392391 is a wasteful number, since it uses less digits than its factorization.

61745392391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111493.

The product of its digits is 1224720, while the sum is 50.

The spelling of 61745392391 in words is "sixty-one billion, seven hundred forty-five million, three hundred ninety-two thousand, three hundred ninety-one".