1812667664 has 10 divisors (see below), whose sum is σ = 3512043630. Its totient is φ = 906333824.

The previous prime is 1812667663. The next prime is 1812667693. The reversal of 1812667664 is 4667662181.

It can be written as a sum of positive squares in only one way, i.e., 1521624064 + 291043600 = 39008^2 + 17060^2 .

It is a super-3 number, since 3×1812667664³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1812667663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56645849 + ... + 56645880.

It is an arithmetic number, because the mean of its divisors is an integer number (351204363).

Almost surely, 2^1812667664 is an apocalyptic number.

It is an amenable number.

1812667664 is a deficient number, since it is larger than the sum of its proper divisors (1699375966).

1812667664 is a wasteful number, since it uses less digits than its factorization.

1812667664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113291737 (or 113291731 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The square root of 1812667664 is about 42575.4349830979. The cubic root of 1812667664 is about 1219.2873343806.

The spelling of 1812667664 in words is "one billion, eight hundred twelve million, six hundred sixty-seven thousand, six hundred sixty-four".