19780752061 has 16 divisors (see below), whose sum is σ = 23051952000. Its totient is φ = 16621420608.

The previous prime is 19780752059. The next prime is 19780752127. The reversal of 19780752061 is 16025708791.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19780752061 - 2¹ = 19780752059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19780752661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445915 + ... + 488263.

It is an arithmetic number, because the mean of its divisors is an integer number (1440747000).

Almost surely, 2^19780752061 is an apocalyptic number.

It is an amenable number.

19780752061 is a deficient number, since it is larger than the sum of its proper divisors (3271199939).

19780752061 is a wasteful number, since it uses less digits than its factorization.

19780752061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43668.

The product of its (nonzero) digits is 211680, while the sum is 46.

The spelling of 19780752061 in words is "nineteen billion, seven hundred eighty million, seven hundred fifty-two thousand, sixty-one".