1618157911 has 2 divisors, whose sum is σ = 1618157912. Its totient is φ = 1618157910.

The previous prime is 1618157909. The next prime is 1618157929. The reversal of 1618157911 is 1197518161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1618157911 - 2¹ = 1618157909 is a prime.

Together with 1618157909, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1618157941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809078955 + 809078956.

It is an arithmetic number, because the mean of its divisors is an integer number (809078956).

Almost surely, 2^1618157911 is an apocalyptic number.

1618157911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618157911 is an equidigital number, since it uses as much as digits as its factorization.

1618157911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 40.

The square root of 1618157911 is about 40226.3335515431. Note that the first 3 decimals coincide. The cubic root of 1618157911 is about 1174.0149670581.

The spelling of 1618157911 in words is "one billion, six hundred eighteen million, one hundred fifty-seven thousand, nine hundred eleven".