61645063 has 8 divisors (see below), whose sum is σ = 65387520. Its totient is φ = 57952440.

The previous prime is 61645061. The next prime is 61645079. The reversal of 61645063 is 36054616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61645063 - 2¹ = 61645061 is a prime.

It is a super-2 number, since 2×61645063² = 7600227584547938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61645061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9895 + ... + 14872.

It is an arithmetic number, because the mean of its divisors is an integer number (8173440).

Almost surely, 2^61645063 is an apocalyptic number.

61645063 is a deficient number, since it is larger than the sum of its proper divisors (3742457).

61645063 is a wasteful number, since it uses less digits than its factorization.

61645063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24917.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 61645063 is about 7851.4370022309. The cubic root of 61645063 is about 395.0324451264.

Adding to 61645063 its reverse (36054616), we get a palindrome (97699679).

The spelling of 61645063 in words is "sixty-one million, six hundred forty-five thousand, sixty-three".