6780157 has 2 divisors, whose sum is σ = 6780158. Its totient is φ = 6780156.

The previous prime is 6780143. The next prime is 6780217. The reversal of 6780157 is 7510876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4968441 + 1811716 = 2229^2 + 1346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6780157 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6780757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3390078 + 3390079.

It is an arithmetic number, because the mean of its divisors is an integer number (3390079).

Almost surely, 2^6780157 is an apocalyptic number.

It is an amenable number.

6780157 is a deficient number, since it is larger than the sum of its proper divisors (1).

6780157 is an equidigital number, since it uses as much as digits as its factorization.

6780157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 6780157 is about 2603.8734608272. The cubic root of 6780157 is about 189.2691870769.

The spelling of 6780157 in words is "six million, seven hundred eighty thousand, one hundred fifty-seven".