1662081957 has 32 divisors (see below), whose sum is σ = 2567070720. Its totient is φ = 1061640000.

The previous prime is 1662081947. The next prime is 1662081991. The reversal of 1662081957 is 7591802661.

1662081957 is a `hidden beast` number, since 1 + 6 + 620 + 8 + 19 + 5 + 7 = 666.

It is not a de Polignac number, because 1662081957 - 2¹⁹ = 1661557669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662081917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74707 + ... + 94367.

It is an arithmetic number, because the mean of its divisors is an integer number (80220960).

Almost surely, 2^1662081957 is an apocalyptic number.

It is an amenable number.

1662081957 is a deficient number, since it is larger than the sum of its proper divisors (904988763).

1662081957 is a wasteful number, since it uses less digits than its factorization.

1662081957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19802 (or 19796 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 1662081957 is about 40768.6393812695. The cubic root of 1662081957 is about 1184.5429482381.

The spelling of 1662081957 in words is "one billion, six hundred sixty-two million, eighty-one thousand, nine hundred fifty-seven".