61616785 has 4 divisors (see below), whose sum is σ = 73940148. Its totient is φ = 49293424.

The previous prime is 61616777. The next prime is 61616831. The reversal of 61616785 is 58761616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31013761 + 30603024 = 5569^2 + 5532^2 .

It is a cyclic number.

It is not a de Polignac number, because 61616785 - 2³ = 61616777 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6161674 + ... + 6161683.

It is an arithmetic number, because the mean of its divisors is an integer number (18485037).

Almost surely, 2^61616785 is an apocalyptic number.

It is an amenable number.

61616785 is a deficient number, since it is larger than the sum of its proper divisors (12323363).

61616785 is a wasteful number, since it uses less digits than its factorization.

61616785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12323362.

The product of its digits is 60480, while the sum is 40.

The square root of 61616785 is about 7849.6359788209. The cubic root of 61616785 is about 394.9720324160.

The spelling of 61616785 in words is "sixty-one million, six hundred sixteen thousand, seven hundred eighty-five".