1948951666 has 8 divisors (see below), whose sum is σ = 2927552940. Its totient is φ = 973100688.

The previous prime is 1948951649. The next prime is 1948951681. The reversal of 1948951666 is 6661598491.

It can be written as a sum of positive squares in 2 ways, for example, as 1544097025 + 404854641 = 39295^2 + 20121^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 685801 + ... + 688636.

Almost surely, 2^1948951666 is an apocalyptic number.

1948951666 is a deficient number, since it is larger than the sum of its proper divisors (978601274).

1948951666 is a wasteful number, since it uses less digits than its factorization.

1948951666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375148.

The product of its digits is 2799360, while the sum is 55.

The square root of 1948951666 is about 44146.9326907318. The cubic root of 1948951666 is about 1249.1090538695.

The spelling of 1948951666 in words is "one billion, nine hundred forty-eight million, nine hundred fifty-one thousand, six hundred sixty-six".