157223777 has 2 divisors, whose sum is σ = 157223778. Its totient is φ = 157223776.

The previous prime is 157223753. The next prime is 157223809. The reversal of 157223777 is 777322751.

It is a happy number.

157223777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128504896 + 28718881 = 11336^2 + 5359^2 .

It is a cyclic number.

It is not a de Polignac number, because 157223777 - 2¹⁰ = 157222753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157223747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78611888 + 78611889.

It is an arithmetic number, because the mean of its divisors is an integer number (78611889).

Almost surely, 2^157223777 is an apocalyptic number.

It is an amenable number.

157223777 is a deficient number, since it is larger than the sum of its proper divisors (1).

157223777 is an equidigital number, since it uses as much as digits as its factorization.

157223777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144060, while the sum is 41.

The square root of 157223777 is about 12538.8905809087. The cubic root of 157223777 is about 539.7252569010.

The spelling of 157223777 in words is "one hundred fifty-seven million, two hundred twenty-three thousand, seven hundred seventy-seven".