1662978956 has 12 divisors (see below), whose sum is σ = 2959539240. Its totient is φ = 817396320.

The previous prime is 1662978937. The next prime is 1662978979. The reversal of 1662978956 is 6598792661.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a junction number, because it is equal to n+sod(n) for n = 1662978895 and 1662978904.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3523025 + ... + 3523496.

It is an arithmetic number, because the mean of its divisors is an integer number (246628270).

Almost surely, 2^1662978956 is an apocalyptic number.

It is an amenable number.

1662978956 is a deficient number, since it is larger than the sum of its proper divisors (1296560284).

1662978956 is a wasteful number, since it uses less digits than its factorization.

1662978956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7046584 (or 7046582 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 59.

The square root of 1662978956 is about 40779.6389881029. The cubic root of 1662978956 is about 1184.7560028649.

The spelling of 1662978956 in words is "one billion, six hundred sixty-two million, nine hundred seventy-eight thousand, nine hundred fifty-six".