218577156157 has 2 divisors, whose sum is σ = 218577156158. Its totient is φ = 218577156156.

The previous prime is 218577156137. The next prime is 218577156163. The reversal of 218577156157 is 751651775812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209319060196 + 9258095961 = 457514^2 + 96219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218577156157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218577156098 and 218577156107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218577156137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109288578078 + 109288578079.

It is an arithmetic number, because the mean of its divisors is an integer number (109288578079).

Almost surely, 2^218577156157 is an apocalyptic number.

It is an amenable number.

218577156157 is a deficient number, since it is larger than the sum of its proper divisors (1).

218577156157 is an equidigital number, since it uses as much as digits as its factorization.

218577156157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4116000, while the sum is 55.

The spelling of 218577156157 in words is "two hundred eighteen billion, five hundred seventy-seven million, one hundred fifty-six thousand, one hundred fifty-seven".