1662634957 has 12 divisors (see below), whose sum is σ = 1757225340. Its totient is φ = 1572904512.

The previous prime is 1662634937. The next prime is 1662634973. The reversal of 1662634957 is 7594362661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 835152201 + 827482756 = 28899^2 + 28766^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1662634957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1662634957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662634907) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 289203 + ... + 294895.

It is an arithmetic number, because the mean of its divisors is an integer number (146435445).

Almost surely, 2^1662634957 is an apocalyptic number.

It is an amenable number.

1662634957 is a deficient number, since it is larger than the sum of its proper divisors (94590383).

1662634957 is an equidigital number, since it uses as much as digits as its factorization.

1662634957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6540 (or 6521 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 49.

The square root of 1662634957 is about 40775.4209910824. The cubic root of 1662634957 is about 1184.6743055021.

The spelling of 1662634957 in words is "one billion, six hundred sixty-two million, six hundred thirty-four thousand, nine hundred fifty-seven".