18737158157 has 2 divisors, whose sum is σ = 18737158158. Its totient is φ = 18737158156.

The previous prime is 18737158093. The next prime is 18737158183. The reversal of 18737158157 is 75185173781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15547845481 + 3189312676 = 124691^2 + 56474^2 .

It is an emirp because it is prime and its reverse (75185173781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18737158157 - 2⁶ = 18737158093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18737158099 and 18737158108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18737151157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9368579078 + 9368579079.

It is an arithmetic number, because the mean of its divisors is an integer number (9368579079).

Almost surely, 2^18737158157 is an apocalyptic number.

It is an amenable number.

18737158157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18737158157 is an equidigital number, since it uses as much as digits as its factorization.

18737158157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1646400, while the sum is 53.

The spelling of 18737158157 in words is "eighteen billion, seven hundred thirty-seven million, one hundred fifty-eight thousand, one hundred fifty-seven".