9976132811978 has 4 divisors (see below), whose sum is σ = 14964199217970. Its totient is φ = 4988066405988.

The previous prime is 9976132811971. The next prime is 9976132811989. The reversal of 9976132811978 is 8791182316799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9924850039129 + 51282772849 = 3150373^2 + 226457^2 .

It is not an unprimeable number, because it can be changed into a prime (9976132811971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2494033202993 + ... + 2494033202996.

Almost surely, 2^{9976132811978} is an apocalyptic number.

9976132811978 is a deficient number, since it is larger than the sum of its proper divisors (4988066405992).

9976132811978 is a wasteful number, since it uses less digits than its factorization.

9976132811978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4988066405991.

The product of its digits is 82301184, while the sum is 71.

The spelling of 9976132811978 in words is "nine trillion, nine hundred seventy-six billion, one hundred thirty-two million, eight hundred eleven thousand, nine hundred seventy-eight".