1018917126691 has 16 divisors (see below), whose sum is σ = 1047166921728. Its totient is φ = 991028844000.

The previous prime is 1018917126589. The next prime is 1018917126709. The reversal of 1018917126691 is 1966217198101.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1018917126691 - 2⁹ = 1018917126179 is a prime.

It is a super-2 number, since 2×1018917126691² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1018917126791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3766746 + ... + 4028176.

It is an arithmetic number, because the mean of its divisors is an integer number (65447932608).

Almost surely, 2^{1018917126691} is an apocalyptic number.

1018917126691 is a deficient number, since it is larger than the sum of its proper divisors (28249795037).

1018917126691 is a wasteful number, since it uses less digits than its factorization.

1018917126691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262122.

The product of its (nonzero) digits is 326592, while the sum is 52.

The spelling of 1018917126691 in words is "one trillion, eighteen billion, nine hundred seventeen million, one hundred twenty-six thousand, six hundred ninety-one".