19549680551 has 2 divisors, whose sum is σ = 19549680552. Its totient is φ = 19549680550.

The previous prime is 19549680547. The next prime is 19549680581. The reversal of 19549680551 is 15508694591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19549680551 - 2² = 19549680547 is a prime.

It is a super-2 number, since 2×19549680551² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19549680493 and 19549680502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19549680511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9774840275 + 9774840276.

It is an arithmetic number, because the mean of its divisors is an integer number (9774840276).

Almost surely, 2^19549680551 is an apocalyptic number.

19549680551 is a deficient number, since it is larger than the sum of its proper divisors (1).

19549680551 is an equidigital number, since it uses as much as digits as its factorization.

19549680551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944000, while the sum is 53.

The spelling of 19549680551 in words is "nineteen billion, five hundred forty-nine million, six hundred eighty thousand, five hundred fifty-one".