61697767 has 2 divisors, whose sum is σ = 61697768. Its totient is φ = 61697766.

The previous prime is 61697749. The next prime is 61697773. The reversal of 61697767 is 76779616.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61697767 is a prime.

It is a super-2 number, since 2×61697767² = 7613228905572578, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61697767.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61697717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30848883 + 30848884.

It is an arithmetic number, because the mean of its divisors is an integer number (30848884).

Almost surely, 2^61697767 is an apocalyptic number.

61697767 is a deficient number, since it is larger than the sum of its proper divisors (1).

61697767 is an equidigital number, since it uses as much as digits as its factorization.

61697767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 666792, while the sum is 49.

The square root of 61697767 is about 7854.7926134304. The cubic root of 61697767 is about 395.1449919032.

The spelling of 61697767 in words is "sixty-one million, six hundred ninety-seven thousand, seven hundred sixty-seven".