1660563551 has 8 divisors (see below), whose sum is σ = 1700568144. Its totient is φ = 1620622080.

The previous prime is 1660563547. The next prime is 1660563559. The reversal of 1660563551 is 1553650661.

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

It is a cyclic number.

It is not a de Polignac number, because 1660563551 - 2² = 1660563547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660563559) 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, 39791 + ... + 70031.

It is an arithmetic number, because the mean of its divisors is an integer number (212571018).

Almost surely, 2^1660563551 is an apocalyptic number.

1660563551 is a deficient number, since it is larger than the sum of its proper divisors (40004593).

1660563551 is a wasteful number, since it uses less digits than its factorization.

1660563551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31561.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 1660563551 is about 40750.0128957035. The cubic root of 1660563551 is about 1184.1821226476.

The spelling of 1660563551 in words is "one billion, six hundred sixty million, five hundred sixty-three thousand, five hundred fifty-one".