19780657797 has 32 divisors (see below), whose sum is σ = 27088588800. Its totient is φ = 12836275200.

The previous prime is 19780657783. The next prime is 19780657811. The reversal of 19780657797 is 79775608791.

It is an interprime number because it is at equal distance from previous prime (19780657783) and next prime (19780657811).

It is not a de Polignac number, because 19780657797 - 2⁴ = 19780657781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19780650797) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4346079 + ... + 4350627.

It is an arithmetic number, because the mean of its divisors is an integer number (846518400).

Almost surely, 2^19780657797 is an apocalyptic number.

It is an amenable number.

19780657797 is a deficient number, since it is larger than the sum of its proper divisors (7307931003).

19780657797 is a wasteful number, since it uses less digits than its factorization.

19780657797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4893.

The product of its (nonzero) digits is 46675440, while the sum is 66.

The spelling of 19780657797 in words is "nineteen billion, seven hundred eighty million, six hundred fifty-seven thousand, seven hundred ninety-seven".