1261676564 has 12 divisors (see below), whose sum is σ = 2279157888. Its totient is φ = 610488600.

The previous prime is 1261676509. The next prime is 1261676587. The reversal of 1261676564 is 4656761621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5087282 + ... + 5087529.

It is an arithmetic number, because the mean of its divisors is an integer number (189929824).

Almost surely, 2^1261676564 is an apocalyptic number.

It is an amenable number.

1261676564 is a deficient number, since it is larger than the sum of its proper divisors (1017481324).

1261676564 is a wasteful number, since it uses less digits than its factorization.

1261676564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10174846 (or 10174844 counting only the distinct ones).

The product of its digits is 362880, while the sum is 44.

The square root of 1261676564 is about 35520.0867679120. The cubic root of 1261676564 is about 1080.5611407223.

The spelling of 1261676564 in words is "one billion, two hundred sixty-one million, six hundred seventy-six thousand, five hundred sixty-four".