18390915158389 has 2 divisors, whose sum is σ = 18390915158390. Its totient is φ = 18390915158388.

The previous prime is 18390915158347. The next prime is 18390915158431. The reversal of 18390915158389 is 98385151909381.

It is a balanced prime because it is at equal distance from previous prime (18390915158347) and next prime (18390915158431).

It can be written as a sum of positive squares in only one way, i.e., 9459573712164 + 8931341446225 = 3075642^2 + 2988535^2 .

It is a cyclic number.

It is not a de Polignac number, because 18390915158389 - 2²⁷ = 18390780940661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18390915158789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9195457579194 + 9195457579195.

It is an arithmetic number, because the mean of its divisors is an integer number (9195457579195).

Almost surely, 2^{18390915158389} is an apocalyptic number.

It is an amenable number.

18390915158389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18390915158389 is an equidigital number, since it uses as much as digits as its factorization.

18390915158389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 83980800, while the sum is 70.

The spelling of 18390915158389 in words is "eighteen trillion, three hundred ninety billion, nine hundred fifteen million, one hundred fifty-eight thousand, three hundred eighty-nine".