99780375251 has 2 divisors, whose sum is σ = 99780375252. Its totient is φ = 99780375250.

The previous prime is 99780375239. The next prime is 99780375269. The reversal of 99780375251 is 15257308799.

It is a weak prime.

It is an emirp because it is prime and its reverse (15257308799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99780375251 - 2³⁰ = 98706633427 is a prime.

It is a super-2 number, since 2×99780375251² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99780375271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49890187625 + 49890187626.

It is an arithmetic number, because the mean of its divisors is an integer number (49890187626).

Almost surely, 2^99780375251 is an apocalyptic number.

99780375251 is a deficient number, since it is larger than the sum of its proper divisors (1).

99780375251 is an equidigital number, since it uses as much as digits as its factorization.

99780375251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4762800, while the sum is 56.

The spelling of 99780375251 in words is "ninety-nine billion, seven hundred eighty million, three hundred seventy-five thousand, two hundred fifty-one".