1664671011 has 16 divisors (see below), whose sum is σ = 2282598144. Its totient is φ = 1078654304.

The previous prime is 1664671007. The next prime is 1664671013. The reversal of 1664671011 is 1101764661.

It is not a de Polignac number, because 1664671011 - 2² = 1664671007 is a prime.

It is a super-2 number, since 2×1664671011² = 5542259149727524242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1664671013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31911 + ... + 65936.

It is an arithmetic number, because the mean of its divisors is an integer number (142662384).

Almost surely, 2^1664671011 is an apocalyptic number.

1664671011 is a deficient number, since it is larger than the sum of its proper divisors (617927133).

1664671011 is a wasteful number, since it uses less digits than its factorization.

1664671011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98010.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1664671011 is about 40800.3800349948. The cubic root of 1664671011 is about 1185.1576902079.

The spelling of 1664671011 in words is "one billion, six hundred sixty-four million, six hundred seventy-one thousand, eleven".