1206664551 has 6 divisors (see below), whose sum is σ = 1742959920. Its totient is φ = 804443028.

The previous prime is 1206664517. The next prime is 1206664583. The reversal of 1206664551 is 1554666021.

It is not a de Polignac number, because 1206664551 - 2¹¹ = 1206662503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206664351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67036911 + ... + 67036928.

It is an arithmetic number, because the mean of its divisors is an integer number (290493320).

Almost surely, 2^1206664551 is an apocalyptic number.

1206664551 is a deficient number, since it is larger than the sum of its proper divisors (536295369).

1206664551 is a wasteful number, since it uses less digits than its factorization.

1206664551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134073845 (or 134073842 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1206664551 is about 34737.0774677433. The cubic root of 1206664551 is about 1064.6222001875.

The spelling of 1206664551 in words is "one billion, two hundred six million, six hundred sixty-four thousand, five hundred fifty-one".