1656106551 has 18 divisors (see below), whose sum is σ = 2629394040. Its totient is φ = 1003700280.

The previous prime is 1656106549. The next prime is 1656106579. The reversal of 1656106551 is 1556016561.

It is not a de Polignac number, because 1656106551 - 2¹ = 1656106549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656106531) 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 17 ways as a sum of consecutive naturals, for example, 759291 + ... + 761468.

Almost surely, 2^1656106551 is an apocalyptic number.

1656106551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1656106551 is a deficient number, since it is larger than the sum of its proper divisors (973287489).

1656106551 is a wasteful number, since it uses less digits than its factorization.

1656106551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520787 (or 1520773 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1656106551 is about 40695.2890516826. The cubic root of 1656106551 is about 1183.1217138118.

The spelling of 1656106551 in words is "one billion, six hundred fifty-six million, one hundred six thousand, five hundred fifty-one".