65740675781 has 8 divisors (see below), whose sum is σ = 72727201728. Its totient is φ = 58922500000.

The previous prime is 65740675769. The next prime is 65740675789. The reversal of 65740675781 is 18757604756.

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 65740675781 - 2⁶ = 65740675717 is a prime.

It is a super-2 number, since 2×65740675781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65740675789) 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, 42086720 + ... + 42088281.

It is an arithmetic number, because the mean of its divisors is an integer number (9090900216).

Almost surely, 2^65740675781 is an apocalyptic number.

It is an amenable number.

65740675781 is a deficient number, since it is larger than the sum of its proper divisors (6986525947).

65740675781 is a wasteful number, since it uses less digits than its factorization.

65740675781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84175083.

The product of its (nonzero) digits is 9878400, while the sum is 56.

The spelling of 65740675781 in words is "sixty-five billion, seven hundred forty million, six hundred seventy-five thousand, seven hundred eighty-one".