97715864777 has 4 divisors (see below), whose sum is σ = 98371676100. Its totient is φ = 97060053456.

The previous prime is 97715864747. The next prime is 97715864797. The reversal of 97715864777 is 77746851779.

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

It can be written as a sum of positive squares in 2 ways, for example, as 43521887161 + 54193977616 = 208619^2 + 232796^2 .

It is a cyclic number.

It is not a de Polignac number, because 97715864777 - 2⁶ = 97715864713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97715864717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327905438 + ... + 327905735.

It is an arithmetic number, because the mean of its divisors is an integer number (24592919025).

Almost surely, 2^97715864777 is an apocalyptic number.

It is an amenable number.

97715864777 is a deficient number, since it is larger than the sum of its proper divisors (655811323).

97715864777 is a wasteful number, since it uses less digits than its factorization.

97715864777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655811322.

The product of its digits is 145212480, while the sum is 68.

The spelling of 97715864777 in words is "ninety-seven billion, seven hundred fifteen million, eight hundred sixty-four thousand, seven hundred seventy-seven".