61637669 has 2 divisors, whose sum is σ = 61637670. Its totient is φ = 61637668.

The previous prime is 61637627. The next prime is 61637687. The reversal of 61637669 is 96673616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61230625 + 407044 = 7825^2 + 638^2 .

It is a cyclic number.

It is not a de Polignac number, because 61637669 - 2⁸ = 61637413 is a prime.

It is a super-2 number, since 2×61637669² = 7598404479507122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61637689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30818834 + 30818835.

It is an arithmetic number, because the mean of its divisors is an integer number (30818835).

Almost surely, 2^61637669 is an apocalyptic number.

It is an amenable number.

61637669 is a deficient number, since it is larger than the sum of its proper divisors (1).

61637669 is an equidigital number, since it uses as much as digits as its factorization.

61637669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 44.

The square root of 61637669 is about 7850.9661188926. The cubic root of 61637669 is about 395.0166504758.

The spelling of 61637669 in words is "sixty-one million, six hundred thirty-seven thousand, six hundred sixty-nine".