551661511507 has 8 divisors (see below), whose sum is σ = 575701719840. Its totient is φ = 527625880320.

The previous prime is 551661511493. The next prime is 551661511517. The reversal of 551661511507 is 705115166155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551661511507 is a prime.

It is a super-2 number, since 2×551661511507² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551661511517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 896844 + ... + 1381177.

It is an arithmetic number, because the mean of its divisors is an integer number (71962714980).

Almost surely, 2^551661511507 is an apocalyptic number.

551661511507 is a deficient number, since it is larger than the sum of its proper divisors (24040208333).

551661511507 is a wasteful number, since it uses less digits than its factorization.

551661511507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288573.

The product of its (nonzero) digits is 157500, while the sum is 43.

The spelling of 551661511507 in words is "five hundred fifty-one billion, six hundred sixty-one million, five hundred eleven thousand, five hundred seven".