61605855 has 12 divisors (see below), whose sum is σ = 106783560. Its totient is φ = 32856432.

The previous prime is 61605839. The next prime is 61605857. The reversal of 61605855 is 55850616.

It is not a de Polignac number, because 61605855 - 2⁴ = 61605839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61605857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 684465 + ... + 684554.

It is an arithmetic number, because the mean of its divisors is an integer number (8898630).

Almost surely, 2^61605855 is an apocalyptic number.

61605855 is a deficient number, since it is larger than the sum of its proper divisors (45177705).

61605855 is a wasteful number, since it uses less digits than its factorization.

61605855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369030 (or 1369027 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 61605855 is about 7848.9397373148. The cubic root of 61605855 is about 394.9486767692.

The spelling of 61605855 in words is "sixty-one million, six hundred five thousand, eight hundred fifty-five".