1066615651 has 4 divisors (see below), whose sum is σ = 1077176304. Its totient is φ = 1056055000.

The previous prime is 1066615643. The next prime is 1066615657. The reversal of 1066615651 is 1565166601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1565166601 = 34127 ⋅45863.

It is a cyclic number.

It is not a de Polignac number, because 1066615651 - 2³ = 1066615643 is a prime.

It is a super-2 number, since 2×1066615651² = 2275337893916307602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1066615651.

It is not an unprimeable number, because it can be changed into a prime (1066615657) 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 3 ways as a sum of consecutive naturals, for example, 5280175 + ... + 5280376.

It is an arithmetic number, because the mean of its divisors is an integer number (269294076).

Almost surely, 2^1066615651 is an apocalyptic number.

1066615651 is a deficient number, since it is larger than the sum of its proper divisors (10560653).

1066615651 is a wasteful number, since it uses less digits than its factorization.

1066615651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560652.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1066615651 is about 32659.0822130690. The cubic root of 1066615651 is about 1021.7296205206.

The spelling of 1066615651 in words is "one billion, sixty-six million, six hundred fifteen thousand, six hundred fifty-one".