61205755 has 16 divisors (see below), whose sum is σ = 80186400. Its totient is φ = 44575488.

The previous prime is 61205741. The next prime is 61205779. The reversal of 61205755 is 55750216.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61205755 is a prime.

It is a super-2 number, since 2×61205755² = 7492288890240050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1705 + ... + 11194.

It is an arithmetic number, because the mean of its divisors is an integer number (5011650).

Almost surely, 2^61205755 is an apocalyptic number.

61205755 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61205755 is a deficient number, since it is larger than the sum of its proper divisors (18980645).

61205755 is a wasteful number, since it uses less digits than its factorization.

61205755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12990.

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 61205755 is about 7823.4107012223. The cubic root of 61205755 is about 394.0918194105.

The spelling of 61205755 in words is "sixty-one million, two hundred five thousand, seven hundred fifty-five".