61309665896 has 8 divisors (see below), whose sum is σ = 114955623570. Its totient is φ = 30654832944.

The previous prime is 61309665883. The next prime is 61309665941. The reversal of 61309665896 is 69856690316.

It can be written as a sum of positive squares in only one way, i.e., 53784103396 + 7525562500 = 231914^2 + 86750^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3831854111 + ... + 3831854126.

Almost surely, 2^61309665896 is an apocalyptic number.

It is an amenable number.

61309665896 is a deficient number, since it is larger than the sum of its proper divisors (53645957674).

61309665896 is a wasteful number, since it uses less digits than its factorization.

61309665896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7663708243 (or 7663708239 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 59.

The spelling of 61309665896 in words is "sixty-one billion, three hundred nine million, six hundred sixty-five thousand, eight hundred ninety-six".