1018158459949 has 4 divisors (see below), whose sum is σ = 1018424093436. Its totient is φ = 1017892826464.

The previous prime is 1018158459911. The next prime is 1018158459971. The reversal of 1018158459949 is 9499548518101.

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 96654457449 + 921504002500 = 310893^2 + 959950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1018158459949 - 2¹³ = 1018158451757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1018158459349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132810994 + ... + 132818659.

It is an arithmetic number, because the mean of its divisors is an integer number (254606023359).

Almost surely, 2^{1018158459949} is an apocalyptic number.

It is an amenable number.

1018158459949 is a deficient number, since it is larger than the sum of its proper divisors (265633487).

1018158459949 is an equidigital number, since it uses as much as digits as its factorization.

1018158459949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265633486.

The product of its (nonzero) digits is 18662400, while the sum is 64.

The spelling of 1018158459949 in words is "one trillion, eighteen billion, one hundred fifty-eight million, four hundred fifty-nine thousand, nine hundred forty-nine".