1566501616551 has 16 divisors (see below), whose sum is σ = 2203969063680. Its totient is φ = 987704646720.

The previous prime is 1566501616441. The next prime is 1566501616583. The reversal of 1566501616551 is 1556161056651.

It is not a de Polignac number, because 1566501616551 - 2⁹ = 1566501616039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1566501616551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566501616051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127538365 + ... + 127550646.

It is an arithmetic number, because the mean of its divisors is an integer number (137748066480).

Almost surely, 2^{1566501616551} is an apocalyptic number.

1566501616551 is a deficient number, since it is larger than the sum of its proper divisors (637467447129).

1566501616551 is a wasteful number, since it uses less digits than its factorization.

1566501616551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255089126.

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 1566501616551 in words is "one trillion, five hundred sixty-six billion, five hundred one million, six hundred sixteen thousand, five hundred fifty-one".