61556455 has 8 divisors (see below), whose sum is σ = 73990800. Its totient is φ = 49163136.

The previous prime is 61556431. The next prime is 61556459. The reversal of 61556455 is 55465516.

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 61556455 - 2¹⁵ = 61523687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61556459) 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, 6850 + ... + 13039.

It is an arithmetic number, because the mean of its divisors is an integer number (9248850).

Almost surely, 2^61556455 is an apocalyptic number.

61556455 is a deficient number, since it is larger than the sum of its proper divisors (12434345).

61556455 is a wasteful number, since it uses less digits than its factorization.

61556455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20513.

The product of its digits is 90000, while the sum is 37.

The square root of 61556455 is about 7845.7921843495. The cubic root of 61556455 is about 394.8430824664.

It can be divided in two parts, 61 and 556455, that added together give a square (556516 = 746²).

The spelling of 61556455 in words is "sixty-one million, five hundred fifty-six thousand, four hundred fifty-five".