662156461 has 2 divisors, whose sum is σ = 662156462. Its totient is φ = 662156460.

The previous prime is 662156459. The next prime is 662156491. The reversal of 662156461 is 164651266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619711236 + 42445225 = 24894^2 + 6515^2 .

It is a cyclic number.

It is not a de Polignac number, because 662156461 - 2¹ = 662156459 is a prime.

Together with 662156459, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 662156461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (662156491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331078230 + 331078231.

It is an arithmetic number, because the mean of its divisors is an integer number (331078231).

Almost surely, 2^662156461 is an apocalyptic number.

It is an amenable number.

662156461 is a deficient number, since it is larger than the sum of its proper divisors (1).

662156461 is an equidigital number, since it uses as much as digits as its factorization.

662156461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The square root of 662156461 is about 25732.4009956319. The cubic root of 662156461 is about 871.6059915983.

The spelling of 662156461 in words is "six hundred sixty-two million, one hundred fifty-six thousand, four hundred sixty-one".