1291676664 has 16 divisors (see below), whose sum is σ = 3229191720. Its totient is φ = 430558880.

The previous prime is 1291676663. The next prime is 1291676681. The reversal of 1291676664 is 4666761921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291676663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26909907 + ... + 26909954.

Almost surely, 2^1291676664 is an apocalyptic number.

It is an amenable number.

1291676664 is an abundant number, since it is smaller than the sum of its proper divisors (1937515056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291676664 is a wasteful number, since it uses less digits than its factorization.

1291676664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53819870 (or 53819866 counting only the distinct ones).

The product of its digits is 653184, while the sum is 48.

The square root of 1291676664 is about 35939.9035057135. The cubic root of 1291676664 is about 1089.0586558913.

The spelling of 1291676664 in words is "one billion, two hundred ninety-one million, six hundred seventy-six thousand, six hundred sixty-four".