61555545 has 48 divisors (see below), whose sum is σ = 114528960. Its totient is φ = 31679424.

The previous prime is 61555541. The next prime is 61555547. The reversal of 61555545 is 54555516.

61555545 is a `hidden beast` number, since 61 + 5 + 55 + 545 = 666.

It is not a de Polignac number, because 61555545 - 2² = 61555541 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61555541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34362 + ... + 36108.

It is an arithmetic number, because the mean of its divisors is an integer number (2386020).

Almost surely, 2^61555545 is an apocalyptic number.

It is an amenable number.

61555545 is a deficient number, since it is larger than the sum of its proper divisors (52973415).

61555545 is a wasteful number, since it uses less digits than its factorization.

61555545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796 (or 1784 counting only the distinct ones).

The product of its digits is 75000, while the sum is 36.

The square root of 61555545 is about 7845.7341912660. The cubic root of 61555545 is about 394.8411367784.

It can be divided in two parts, 6 and 1555545, that added together give a palindrome (1555551).

The spelling of 61555545 in words is "sixty-one million, five hundred fifty-five thousand, five hundred forty-five".