76661520828136 has 8 divisors (see below), whose sum is σ = 143740351552770. Its totient is φ = 38330760414064.

The previous prime is 76661520828133. The next prime is 76661520828157. The reversal of 76661520828136 is 63182802516667.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 76005372227236 + 656148600900 = 8718106^2 + 810030^2 .

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

It is not an unprimeable number, because it can be changed into a prime (76661520828133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4791345051751 + ... + 4791345051766.

Almost surely, 2^{76661520828136} is an apocalyptic number.

It is an amenable number.

76661520828136 is a deficient number, since it is larger than the sum of its proper divisors (67078830724634).

76661520828136 is a wasteful number, since it uses less digits than its factorization.

76661520828136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9582690103523 (or 9582690103519 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 61.

The spelling of 76661520828136 in words is "seventy-six trillion, six hundred sixty-one billion, five hundred twenty million, eight hundred twenty-eight thousand, one hundred thirty-six".