1631322664 has 8 divisors (see below), whose sum is σ = 3058730010. Its totient is φ = 815661328.

The previous prime is 1631322631. The next prime is 1631322689. The reversal of 1631322664 is 4662231361.

It can be written as a sum of positive squares in only one way, i.e., 1589616900 + 41705764 = 39870^2 + 6458^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1631322664² = 5322427268160113792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101957659 + ... + 101957674.

Almost surely, 2^1631322664 is an apocalyptic number.

It is an amenable number.

1631322664 is a deficient number, since it is larger than the sum of its proper divisors (1427407346).

1631322664 is a wasteful number, since it uses less digits than its factorization.

1631322664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203915339 (or 203915335 counting only the distinct ones).

The product of its digits is 31104, while the sum is 34.

The square root of 1631322664 is about 40389.6356012282. The cubic root of 1631322664 is about 1177.1901601976.

The spelling of 1631322664 in words is "one billion, six hundred thirty-one million, three hundred twenty-two thousand, six hundred sixty-four".