61556077 has 16 divisors (see below), whose sum is σ = 68584320. Its totient is φ = 54779200.

The previous prime is 61556071. The next prime is 61556081. The reversal of 61556077 is 77065516.

It is a cyclic number.

It is not a de Polignac number, because 61556077 - 2¹⁵ = 61523309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61556071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209943 + ... + 210235.

It is an arithmetic number, because the mean of its divisors is an integer number (4286520).

Almost surely, 2^61556077 is an apocalyptic number.

It is an amenable number.

61556077 is a deficient number, since it is larger than the sum of its proper divisors (7028243).

61556077 is a wasteful number, since it uses less digits than its factorization.

61556077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 61556077 is about 7845.7680949669. The cubic root of 61556077 is about 394.8422742599.

The spelling of 61556077 in words is "sixty-one million, five hundred fifty-six thousand, seventy-seven".