1664747002 has 4 divisors (see below), whose sum is σ = 2497120506. Its totient is φ = 832373500.

The previous prime is 1664746987. The next prime is 1664747039. The reversal of 1664747002 is 2007474661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1091575521 + 573171481 = 33039^2 + 23941^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416186749 + ... + 416186752.

Almost surely, 2^1664747002 is an apocalyptic number.

1664747002 is a deficient number, since it is larger than the sum of its proper divisors (832373504).

1664747002 is an equidigital number, since it uses as much as digits as its factorization.

1664747002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832373503.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 1664747002 is about 40801.3112779479. The cubic root of 1664747002 is about 1185.1757237908.

The spelling of 1664747002 in words is "one billion, six hundred sixty-four million, seven hundred forty-seven thousand, two".