1662721498 has 4 divisors (see below), whose sum is σ = 2494082250. Its totient is φ = 831360748.

The previous prime is 1662721457. The next prime is 1662721507. The reversal of 1662721498 is 8941272661.

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

It can be written as a sum of positive squares in only one way, i.e., 1260037009 + 402684489 = 35497^2 + 20067^2 .

It is a super-2 number, since 2×1662721498² = 5529285559822728008, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 415680373 + ... + 415680376.

Almost surely, 2^1662721498 is an apocalyptic number.

1662721498 is a deficient number, since it is larger than the sum of its proper divisors (831360752).

1662721498 is an equidigital number, since it uses as much as digits as its factorization.

1662721498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831360751.

The product of its digits is 290304, while the sum is 46.

The square root of 1662721498 is about 40776.4821680341. The cubic root of 1662721498 is about 1184.6948594467.

The spelling of 1662721498 in words is "one billion, six hundred sixty-two million, seven hundred twenty-one thousand, four hundred ninety-eight".