19772983687 has 2 divisors, whose sum is σ = 19772983688. Its totient is φ = 19772983686.

The previous prime is 19772983649. The next prime is 19772983709. The reversal of 19772983687 is 78638927791.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19772983687 is a prime.

It is a super-2 number, since 2×19772983687² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19772987687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9886491843 + 9886491844.

It is an arithmetic number, because the mean of its divisors is an integer number (9886491844).

Almost surely, 2^19772983687 is an apocalyptic number.

19772983687 is a deficient number, since it is larger than the sum of its proper divisors (1).

19772983687 is an equidigital number, since it uses as much as digits as its factorization.

19772983687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64012032, while the sum is 67.

The spelling of 19772983687 in words is "nineteen billion, seven hundred seventy-two million, nine hundred eighty-three thousand, six hundred eighty-seven".