99771044473 has 16 divisors (see below), whose sum is σ = 107424905616. Its totient is φ = 92317040640.

The previous prime is 99771044467. The next prime is 99771044479. The reversal of 99771044473 is 37444017799.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (99771044467) and next prime (99771044479).

It can be written as a sum of positive squares in 8 ways, for example, as 25791396409 + 73979648064 = 160597^2 + 271992^2 .

It is a cyclic number.

It is not a de Polignac number, because 99771044473 - 2⁹ = 99771043961 is a prime.

It is a super-2 number, since 2×99771044473² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99771044479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2168415 + ... + 2213947.

It is an arithmetic number, because the mean of its divisors is an integer number (6714056601).

Almost surely, 2^99771044473 is an apocalyptic number.

It is an amenable number.

99771044473 is a deficient number, since it is larger than the sum of its proper divisors (7653861143).

99771044473 is a wasteful number, since it uses less digits than its factorization.

99771044473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47724.

The product of its (nonzero) digits is 5334336, while the sum is 55.

The spelling of 99771044473 in words is "ninety-nine billion, seven hundred seventy-one million, forty-four thousand, four hundred seventy-three".