61553777 has 2 divisors, whose sum is σ = 61553778. Its totient is φ = 61553776.

The previous prime is 61553759. The next prime is 61553797. The reversal of 61553777 is 77735516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60777616 + 776161 = 7796^2 + 881^2 .

It is a cyclic number.

It is not a de Polignac number, because 61553777 - 2¹² = 61549681 is a prime.

It is a Chen prime.

It is equal to p_3648758 and since 61553777 and 3648758 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (61553797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30776888 + 30776889.

It is an arithmetic number, because the mean of its divisors is an integer number (30776889).

Almost surely, 2^61553777 is an apocalyptic number.

It is an amenable number.

61553777 is a deficient number, since it is larger than the sum of its proper divisors (1).

61553777 is an equidigital number, since it uses as much as digits as its factorization.

61553777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 154350, while the sum is 41.

The square root of 61553777 is about 7845.6215177639. The cubic root of 61553777 is about 394.8373565297.

The spelling of 61553777 in words is "sixty-one million, five hundred fifty-three thousand, seven hundred seventy-seven".