99978051619 has 2 divisors, whose sum is σ = 99978051620. Its totient is φ = 99978051618.

The previous prime is 99978051587. The next prime is 99978051697. The reversal of 99978051619 is 91615087999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99978051619 - 2⁵ = 99978051587 is a prime.

It is a super-2 number, since 2×99978051619² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99978058619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49989025809 + 49989025810.

It is an arithmetic number, because the mean of its divisors is an integer number (49989025810).

Almost surely, 2^99978051619 is an apocalyptic number.

99978051619 is a deficient number, since it is larger than the sum of its proper divisors (1).

99978051619 is an equidigital number, since it uses as much as digits as its factorization.

99978051619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11022480, while the sum is 64.

The spelling of 99978051619 in words is "ninety-nine billion, nine hundred seventy-eight million, fifty-one thousand, six hundred nineteen".