70777561 has 2 divisors, whose sum is σ = 70777562. Its totient is φ = 70777560.

The previous prime is 70777547. The next prime is 70777571. The reversal of 70777561 is 16577707.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63043600 + 7733961 = 7940^2 + 2781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70777561 is a prime.

It is a super-2 number, since 2×70777561² = 10018926282217442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70777501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35388780 + 35388781.

It is an arithmetic number, because the mean of its divisors is an integer number (35388781).

Almost surely, 2^70777561 is an apocalyptic number.

It is an amenable number.

70777561 is a deficient number, since it is larger than the sum of its proper divisors (1).

70777561 is an equidigital number, since it uses as much as digits as its factorization.

70777561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72030, while the sum is 40.

The square root of 70777561 is about 8412.9400925004. The cubic root of 70777561 is about 413.6488909359.

The spelling of 70777561 in words is "seventy million, seven hundred seventy-seven thousand, five hundred sixty-one".