61619661 has 12 divisors (see below), whose sum is σ = 91877760. Its totient is φ = 39754440.

The previous prime is 61619653. The next prime is 61619669. The reversal of 61619661 is 16691616.

It is an interprime number because it is at equal distance from previous prime (61619653) and next prime (61619669).

It is not a de Polignac number, because 61619661 - 2³ = 61619653 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61619669) 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, 110151 + ... + 110708.

It is an arithmetic number, because the mean of its divisors is an integer number (7656480).

Almost surely, 2^61619661 is an apocalyptic number.

It is an amenable number.

61619661 is a deficient number, since it is larger than the sum of its proper divisors (30258099).

61619661 is a wasteful number, since it uses less digits than its factorization.

61619661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220896 (or 220893 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 61619661 is about 7849.8191698917. The cubic root of 61619661 is about 394.9781775051.

The spelling of 61619661 in words is "sixty-one million, six hundred nineteen thousand, six hundred sixty-one".