97785127778 has 16 divisors (see below), whose sum is σ = 158346819960. Its totient is φ = 45021246336.

The previous prime is 97785127771. The next prime is 97785127799. The reversal of 97785127778 is 87772158779.

It can be written as a sum of positive squares in 4 ways, for example, as 66818631049 + 30966496729 = 258493^2 + 175973^2 .

It is not an unprimeable number, because it can be changed into a prime (97785127771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4587125 + ... + 4608392.

Almost surely, 2^97785127778 is an apocalyptic number.

97785127778 is a deficient number, since it is larger than the sum of its proper divisors (60561692182).

97785127778 is a wasteful number, since it uses less digits than its factorization.

97785127778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9195941.

The product of its digits is 96808320, while the sum is 68.

The spelling of 97785127778 in words is "ninety-seven billion, seven hundred eighty-five million, one hundred twenty-seven thousand, seven hundred seventy-eight".