1662788879 has 4 divisors (see below), whose sum is σ = 1665102240. Its totient is φ = 1660475520.

The previous prime is 1662788873. The next prime is 1662788903. The reversal of 1662788879 is 9788872661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9788872661 = 97 ⋅100916213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1662788879 is a prime.

It is a super-2 number, since 2×1662788879² = 5529733712252153282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662788873) 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, 1155602 + ... + 1157039.

It is an arithmetic number, because the mean of its divisors is an integer number (416275560).

Almost surely, 2^1662788879 is an apocalyptic number.

1662788879 is a deficient number, since it is larger than the sum of its proper divisors (2313361).

1662788879 is an equidigital number, since it uses as much as digits as its factorization.

1662788879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313360.

The product of its digits is 16257024, while the sum is 62.

The square root of 1662788879 is about 40777.3083834625. The cubic root of 1662788879 is about 1184.7108622963.

The spelling of 1662788879 in words is "one billion, six hundred sixty-two million, seven hundred eighty-eight thousand, eight hundred seventy-nine".