70777997 has 2 divisors, whose sum is σ = 70777998. Its totient is φ = 70777996.

The previous prime is 70777981. The next prime is 70778011. The reversal of 70777997 is 79977707.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48177481 + 22600516 = 6941^2 + 4754^2 .

It is a cyclic number.

It is not a de Polignac number, because 70777997 - 2⁴ = 70777981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70776997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35388998 + 35388999.

It is an arithmetic number, because the mean of its divisors is an integer number (35388999).

Almost surely, 2^70777997 is an apocalyptic number.

It is an amenable number.

70777997 is a deficient number, since it is larger than the sum of its proper divisors (1).

70777997 is an equidigital number, since it uses as much as digits as its factorization.

70777997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1361367, while the sum is 53.

The square root of 70777997 is about 8412.9660049236. The cubic root of 70777997 is about 413.6497403131.

The spelling of 70777997 in words is "seventy million, seven hundred seventy-seven thousand, nine hundred ninety-seven".