61643652430 has 16 divisors (see below), whose sum is σ = 111832266240. Its totient is φ = 24463307232.

The previous prime is 61643652403. The next prime is 61643652443. The reversal of 61643652430 is 3425634616.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24267885 + ... + 24270424.

It is an arithmetic number, because the mean of its divisors is an integer number (6989516640).

Almost surely, 2^61643652430 is an apocalyptic number.

61643652430 is a deficient number, since it is larger than the sum of its proper divisors (50188613810).

61643652430 is a wasteful number, since it uses less digits than its factorization.

61643652430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48538443.

The product of its (nonzero) digits is 311040, while the sum is 40.

It can be divided in two parts, 616436 and 52430, that added together give a palindrome (668866).

The spelling of 61643652430 in words is "sixty-one billion, six hundred forty-three million, six hundred fifty-two thousand, four hundred thirty".