99721573151 has 2 divisors, whose sum is σ = 99721573152. Its totient is φ = 99721573150.

The previous prime is 99721573123. The next prime is 99721573187. The reversal of 99721573151 is 15137512799.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (15137512799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99721573151 - 2³⁰ = 98647831327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99721573151.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99721573111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49860786575 + 49860786576.

It is an arithmetic number, because the mean of its divisors is an integer number (49860786576).

Almost surely, 2^99721573151 is an apocalyptic number.

99721573151 is a deficient number, since it is larger than the sum of its proper divisors (1).

99721573151 is an equidigital number, since it uses as much as digits as its factorization.

99721573151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 595350, while the sum is 50.

The spelling of 99721573151 in words is "ninety-nine billion, seven hundred twenty-one million, five hundred seventy-three thousand, one hundred fifty-one".