1662500641 has 4 divisors (see below), whose sum is σ = 1664506900. Its totient is φ = 1660494384.

The previous prime is 1662500629. The next prime is 1662500647. The reversal of 1662500641 is 1460052661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1460052661 = 4919 ⋅296819.

It can be written as a sum of positive squares in 2 ways, for example, as 423742225 + 1238758416 = 20585^2 + 35196^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662500641 - 2¹³ = 1662492449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662500647) 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 3 ways as a sum of consecutive naturals, for example, 1001886 + ... + 1003543.

It is an arithmetic number, because the mean of its divisors is an integer number (416126725).

Almost surely, 2^1662500641 is an apocalyptic number.

It is an amenable number.

1662500641 is a deficient number, since it is larger than the sum of its proper divisors (2006259).

1662500641 is an equidigital number, since it uses as much as digits as its factorization.

1662500641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2006258.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1662500641 is about 40773.7739361958. The cubic root of 1662500641 is about 1184.6424033301.

The spelling of 1662500641 in words is "one billion, six hundred sixty-two million, five hundred thousand, six hundred forty-one".