61155566 has 24 divisors (see below), whose sum is σ = 98261424. Its totient is φ = 28536480.

The previous prime is 61155553. The next prime is 61155571. The reversal of 61155566 is 66555116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50666 + ... + 51858.

It is an arithmetic number, because the mean of its divisors is an integer number (4094226).

Almost surely, 2^61155566 is an apocalyptic number.

61155566 is a deficient number, since it is larger than the sum of its proper divisors (37105858).

61155566 is a wasteful number, since it uses less digits than its factorization.

61155566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304 (or 1285 counting only the distinct ones).

The product of its digits is 27000, while the sum is 35.

The square root of 61155566 is about 7820.2024270475. The cubic root of 61155566 is about 393.9840709202.

It can be divided in two parts, 6 and 1155566, that multiplied together give a palindrome (6933396).

The spelling of 61155566 in words is "sixty-one million, one hundred fifty-five thousand, five hundred sixty-six".