551948209669 has 2 divisors, whose sum is σ = 551948209670. Its totient is φ = 551948209668.

The previous prime is 551948209643. The next prime is 551948209691. The reversal of 551948209669 is 966902849155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 493840696644 + 58107513025 = 702738^2 + 241055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551948209669 is a prime.

It is a super-2 number, since 2×551948209669² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 551948209669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551948209609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275974104834 + 275974104835.

It is an arithmetic number, because the mean of its divisors is an integer number (275974104835).

Almost surely, 2^551948209669 is an apocalyptic number.

It is an amenable number.

551948209669 is a deficient number, since it is larger than the sum of its proper divisors (1).

551948209669 is an equidigital number, since it uses as much as digits as its factorization.

551948209669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41990400, while the sum is 64.

The spelling of 551948209669 in words is "five hundred fifty-one billion, nine hundred forty-eight million, two hundred nine thousand, six hundred sixty-nine".