99775017623997 has 10 divisors (see below), whose sum is σ = 149046631265598. Its totient is φ = 66516678415944.

The previous prime is 99775017623989. The next prime is 99775017624011. The reversal of 99775017623997 is 79932671057799.

99775017623997 is a `hidden beast` number, since 9 + 9 + 7 + 7 + 50 + 176 + 2 + 399 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 98247862944036 + 1527154679961 = 9912006^2 + 1235781^2 .

It is not a de Polignac number, because 99775017623997 - 2³ = 99775017623989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81), and also a Moran number because the ratio is a prime number: 1231790341037 = 99775017623997 / (9 + 9 + 7 + 7 + 5 + 0 + 1 + 7 + 6 + 2 + 3 + 9 + 9 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99775017623917) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 615895170438 + ... + 615895170599.

Almost surely, 2^{99775017623997} is an apocalyptic number.

It is an amenable number.

99775017623997 is a deficient number, since it is larger than the sum of its proper divisors (49271613641601).

99775017623997 is a wasteful number, since it uses less digits than its factorization.

99775017623997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231790341049 (or 1231790341040 counting only the distinct ones).

The product of its (nonzero) digits is 2835532980, while the sum is 81.

The spelling of 99775017623997 in words is "ninety-nine trillion, seven hundred seventy-five billion, seventeen million, six hundred twenty-three thousand, nine hundred ninety-seven".