61055661 has 16 divisors (see below), whose sum is σ = 83841984. Its totient is φ = 39492864.

The previous prime is 61055651. The next prime is 61055671. The reversal of 61055661 is 16655016.

It is an interprime number because it is at equal distance from previous prime (61055651) and next prime (61055671).

It is not a de Polignac number, because 61055661 - 2⁶ = 61055597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61055651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62005 + ... + 62981.

It is an arithmetic number, because the mean of its divisors is an integer number (5240124).

Almost surely, 2^61055661 is an apocalyptic number.

It is an amenable number.

61055661 is a deficient number, since it is larger than the sum of its proper divisors (22786323).

61055661 is a wasteful number, since it uses less digits than its factorization.

61055661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 61055661 is about 7813.8121938014. The cubic root of 61055661 is about 393.7694138072.

It can be divided in two parts, 61055 and 661, that added together give a palindrome (61716).

The spelling of 61055661 in words is "sixty-one million, fifty-five thousand, six hundred sixty-one".