61616145 has 32 divisors (see below), whose sum is σ = 104832000. Its totient is φ = 30815424.

The previous prime is 61616141. The next prime is 61616167. The reversal of 61616145 is 54161616.

It is not a de Polignac number, because 61616145 - 2² = 61616141 is a prime.

It is a super-2 number, since 2×61616145² = 7593098649322050, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (61616141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28306 + ... + 30404.

It is an arithmetic number, because the mean of its divisors is an integer number (3276000).

Almost surely, 2^61616145 is an apocalyptic number.

It is an amenable number.

61616145 is a deficient number, since it is larger than the sum of its proper divisors (43215855).

61616145 is a wasteful number, since it uses less digits than its factorization.

61616145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229.

The product of its digits is 4320, while the sum is 30.

The square root of 61616145 is about 7849.5952124934. The cubic root of 61616145 is about 394.9706649154.

It can be divided in two parts, 616 and 16145, that added together give a palindrome (16761).

The spelling of 61616145 in words is "sixty-one million, six hundred sixteen thousand, one hundred forty-five".