1340566651 has 4 divisors (see below), whose sum is σ = 1341761512. Its totient is φ = 1339371792.

The previous prime is 1340566649. The next prime is 1340566663. The reversal of 1340566651 is 1566650431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1566650431 = 389 ⋅4027379.

It is a cyclic number.

It is not a de Polignac number, because 1340566651 - 2¹ = 1340566649 is a prime.

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 1340566651.

It is not an unprimeable number, because it can be changed into a prime (1340566751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 595746 + ... + 597991.

It is an arithmetic number, because the mean of its divisors is an integer number (335440378).

Almost surely, 2^1340566651 is an apocalyptic number.

1340566651 is a deficient number, since it is larger than the sum of its proper divisors (1194861).

1340566651 is a wasteful number, since it uses less digits than its factorization.

1340566651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194860.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1340566651 is about 36613.7494802158. The cubic root of 1340566651 is about 1102.6291520037.

The spelling of 1340566651 in words is "one billion, three hundred forty million, five hundred sixty-six thousand, six hundred fifty-one".