1662660451 has 4 divisors (see below), whose sum is σ = 1719993600. Its totient is φ = 1605327304.

The previous prime is 1662660443. The next prime is 1662660457. The reversal of 1662660451 is 1540662661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1662660451 - 2³ = 1662660443 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 1662660451.

It is not an unprimeable number, because it can be changed into a prime (1662660457) 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, 28666531 + ... + 28666588.

It is an arithmetic number, because the mean of its divisors is an integer number (429998400).

Almost surely, 2^1662660451 is an apocalyptic number.

1662660451 is a deficient number, since it is larger than the sum of its proper divisors (57333149).

1662660451 is an equidigital number, since it uses as much as digits as its factorization.

1662660451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57333148.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1662660451 is about 40775.7336046821. The cubic root of 1662660451 is about 1184.6803605359.

It can be divided in two parts, 16626 and 60451, that added together give a palindrome (77077).

The spelling of 1662660451 in words is "one billion, six hundred sixty-two million, six hundred sixty thousand, four hundred fifty-one".