1966428551 has 2 divisors, whose sum is σ = 1966428552. Its totient is φ = 1966428550.

The previous prime is 1966428481. The next prime is 1966428623. The reversal of 1966428551 is 1558246691.

It is a weak prime.

It is an emirp because it is prime and its reverse (1558246691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1966428551 - 2¹⁴ = 1966412167 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1966428496 and 1966428505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1966428151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983214275 + 983214276.

It is an arithmetic number, because the mean of its divisors is an integer number (983214276).

Almost surely, 2^1966428551 is an apocalyptic number.

1966428551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966428551 is an equidigital number, since it uses as much as digits as its factorization.

1966428551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 47.

The square root of 1966428551 is about 44344.4308904737. The cubic root of 1966428551 is about 1252.8316713461.

The spelling of 1966428551 in words is "one billion, nine hundred sixty-six million, four hundred twenty-eight thousand, five hundred fifty-one".