65761800961 has 32 divisors (see below), whose sum is σ = 76559558400. Its totient is φ = 56063508480.

The previous prime is 65761800943. The next prime is 65761800991. The reversal of 65761800961 is 16900816756.

It is a happy number.

It is not a de Polignac number, because 65761800961 - 2⁹ = 65761800449 is a prime.

It is a super-2 number, since 2×65761800961² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65761800991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 930721 + ... + 998881.

It is an arithmetic number, because the mean of its divisors is an integer number (2392486200).

Almost surely, 2^65761800961 is an apocalyptic number.

It is an amenable number.

65761800961 is a deficient number, since it is larger than the sum of its proper divisors (10797757439).

65761800961 is a wasteful number, since it uses less digits than its factorization.

65761800961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68329.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 65761800961 in words is "sixty-five billion, seven hundred sixty-one million, eight hundred thousand, nine hundred sixty-one".