61655555 has 8 divisors (see below), whose sum is σ = 79678032. Its totient is φ = 45530208.

The previous prime is 61655533. The next prime is 61655557. The reversal of 61655555 is 55555616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61655555 - 2¹² = 61651459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61655557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474209 + ... + 474338.

It is an arithmetic number, because the mean of its divisors is an integer number (9959754).

Almost surely, 2^61655555 is an apocalyptic number.

61655555 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61655555 is a deficient number, since it is larger than the sum of its proper divisors (18022477).

61655555 is a wasteful number, since it uses less digits than its factorization.

61655555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948565.

The product of its digits is 112500, while the sum is 38.

The square root of 61655555 is about 7852.1051317465. The cubic root of 61655555 is about 395.0548553844.

It can be divided in two parts, 6 and 1655555, that added together give a palindrome (1655561).

The spelling of 61655555 in words is "sixty-one million, six hundred fifty-five thousand, five hundred fifty-five".