61645607 has 4 divisors (see below), whose sum is σ = 61863720. Its totient is φ = 61427496.

The previous prime is 61645471. The next prime is 61645627. The reversal of 61645607 is 70654616.

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

It is a cyclic number.

It is not a de Polignac number, because 61645607 - 2⁸ = 61645351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61645627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108632 + ... + 109197.

It is an arithmetic number, because the mean of its divisors is an integer number (15465930).

Almost surely, 2^61645607 is an apocalyptic number.

61645607 is a deficient number, since it is larger than the sum of its proper divisors (218113).

61645607 is a wasteful number, since it uses less digits than its factorization.

61645607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218112.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 61645607 is about 7851.4716454942. The cubic root of 61645607 is about 395.0336071390.

Subtracting 61645607 from its reverse (70654616), we obtain a palindrome (9009009).

The spelling of 61645607 in words is "sixty-one million, six hundred forty-five thousand, six hundred seven".