1018358257391 has 4 divisors (see below), whose sum is σ = 1053474059400. Its totient is φ = 983242455384.

The previous prime is 1018358257381. The next prime is 1018358257409. The reversal of 1018358257391 is 1937528538101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1018358257391 - 2⁶ = 1018358257327 is a prime.

It is a super-2 number, since 2×1018358257391² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1018358257381) 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, 17557900961 + ... + 17557901018.

It is an arithmetic number, because the mean of its divisors is an integer number (263368514850).

Almost surely, 2^{1018358257391} is an apocalyptic number.

1018358257391 is a deficient number, since it is larger than the sum of its proper divisors (35115802009).

1018358257391 is an equidigital number, since it uses as much as digits as its factorization.

1018358257391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35115802008.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 1018358257391 in words is "one trillion, eighteen billion, three hundred fifty-eight million, two hundred fifty-seven thousand, three hundred ninety-one".