1662991958 has 4 divisors (see below), whose sum is σ = 2494487940. Its totient is φ = 831495978.

The previous prime is 1662991909. The next prime is 1662991961. The reversal of 1662991958 is 8591992661.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415747988 + ... + 415747991.

It is an arithmetic number, because the mean of its divisors is an integer number (623621985).

Almost surely, 2^1662991958 is an apocalyptic number.

1662991958 is a deficient number, since it is larger than the sum of its proper divisors (831495982).

1662991958 is an equidigital number, since it uses as much as digits as its factorization.

1662991958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831495981.

The product of its digits is 2099520, while the sum is 56.

The square root of 1662991958 is about 40779.7984055831. The cubic root of 1662991958 is about 1184.7590905283.

The spelling of 1662991958 in words is "one billion, six hundred sixty-two million, nine hundred ninety-one thousand, nine hundred fifty-eight".