1565666051 has 16 divisors (see below), whose sum is σ = 1746054144. Its totient is φ = 1396289664.

The previous prime is 1565666041. The next prime is 1565666059. The reversal of 1565666051 is 1506665651.

It is a cyclic number.

It is not a de Polignac number, because 1565666051 - 2²⁶ = 1498557187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1565666059) 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, 23126 + ... + 60548.

It is an arithmetic number, because the mean of its divisors is an integer number (109128384).

Almost surely, 2^1565666051 is an apocalyptic number.

1565666051 is a deficient number, since it is larger than the sum of its proper divisors (180388093).

1565666051 is a wasteful number, since it uses less digits than its factorization.

1565666051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37570.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 1565666051 is about 39568.4982151206. The cubic root of 1565666051 is about 1161.1804399992.

The spelling of 1565666051 in words is "one billion, five hundred sixty-five million, six hundred sixty-six thousand, fifty-one".