61677769 has 2 divisors, whose sum is σ = 61677770. Its totient is φ = 61677768.

The previous prime is 61677767. The next prime is 61677793. The reversal of 61677769 is 96777616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60637369 + 1040400 = 7787^2 + 1020^2 .

It is a cyclic number.

It is not a de Polignac number, because 61677769 - 2¹ = 61677767 is a prime.

It is a super-2 number, since 2×61677769² = 7608294377634722, which contains 22 as substring.

Together with 61677767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61677767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30838884 + 30838885.

It is an arithmetic number, because the mean of its divisors is an integer number (30838885).

Almost surely, 2^61677769 is an apocalyptic number.

It is an amenable number.

61677769 is a deficient number, since it is larger than the sum of its proper divisors (1).

61677769 is an equidigital number, since it uses as much as digits as its factorization.

61677769 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 61677769 is about 7853.5195294849. The cubic root of 61677769 is about 395.1022947153.

The spelling of 61677769 in words is "sixty-one million, six hundred seventy-seven thousand, seven hundred sixty-nine".