61628913643 has 4 divisors (see below), whose sum is σ = 67231542168. Its totient is φ = 56026285120.

The previous prime is 61628913641. The next prime is 61628913673. The reversal of 61628913643 is 34631982616.

It is a happy number.

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 61628913643 - 2¹ = 61628913641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61628913641) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2801314246 + ... + 2801314267.

It is an arithmetic number, because the mean of its divisors is an integer number (16807885542).

Almost surely, 2^61628913643 is an apocalyptic number.

61628913643 is a deficient number, since it is larger than the sum of its proper divisors (5602628525).

61628913643 is a wasteful number, since it uses less digits than its factorization.

61628913643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5602628524.

The product of its digits is 1119744, while the sum is 49.

The spelling of 61628913643 in words is "sixty-one billion, six hundred twenty-eight million, nine hundred thirteen thousand, six hundred forty-three".