61770257 has 2 divisors, whose sum is σ = 61770258. Its totient is φ = 61770256.

The previous prime is 61770253. The next prime is 61770271. The reversal of 61770257 is 75207716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53567761 + 8202496 = 7319^2 + 2864^2 .

It is a cyclic number.

It is not a de Polignac number, because 61770257 - 2² = 61770253 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61770251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30885128 + 30885129.

It is an arithmetic number, because the mean of its divisors is an integer number (30885129).

Almost surely, 2^61770257 is an apocalyptic number.

It is an amenable number.

61770257 is a deficient number, since it is larger than the sum of its proper divisors (1).

61770257 is an equidigital number, since it uses as much as digits as its factorization.

61770257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 61770257 is about 7859.4056391053. The cubic root of 61770257 is about 395.2996860464.

The spelling of 61770257 in words is "sixty-one million, seven hundred seventy thousand, two hundred fifty-seven".