99601200781 has 4 divisors (see below), whose sum is σ = 99605252572. Its totient is φ = 99597148992.

The previous prime is 99601200773. The next prime is 99601200823. The reversal of 99601200781 is 18700210699.

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 18428062500 + 81173138281 = 135750^2 + 284909^2 .

It is a cyclic number.

It is not a de Polignac number, because 99601200781 - 2³ = 99601200773 is a prime.

It is a super-2 number, since 2×99601200781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99601201781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1988796 + ... + 2038261.

It is an arithmetic number, because the mean of its divisors is an integer number (24901313143).

Almost surely, 2^99601200781 is an apocalyptic number.

It is an amenable number.

99601200781 is a deficient number, since it is larger than the sum of its proper divisors (4051791).

99601200781 is a wasteful number, since it uses less digits than its factorization.

99601200781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051790.

The product of its (nonzero) digits is 54432, while the sum is 43.

The spelling of 99601200781 in words is "ninety-nine billion, six hundred one million, two hundred thousand, seven hundred eighty-one".