1265578983 has 12 divisors (see below), whose sum is σ = 1829335560. Its totient is φ = 843129936.

The previous prime is 1265578981. The next prime is 1265579009. The reversal of 1265578983 is 3898755621.

1265578983 is a `hidden beast` number, since 1 + 2 + 6 + 557 + 8 + 9 + 83 = 666.

It is not a de Polignac number, because 1265578983 - 2¹ = 1265578981 is a prime.

It is a super-2 number, since 2×1265578983² = 3203380324422628578, which contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265578981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35313 + ... + 61466.

It is an arithmetic number, because the mean of its divisors is an integer number (152444630).

Almost surely, 2^1265578983 is an apocalyptic number.

1265578983 is a deficient number, since it is larger than the sum of its proper divisors (563756577).

1265578983 is a wasteful number, since it uses less digits than its factorization.

1265578983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98238 (or 98235 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The square root of 1265578983 is about 35574.9769219883. The cubic root of 1265578983 is about 1081.6740678436.

The spelling of 1265578983 in words is "one billion, two hundred sixty-five million, five hundred seventy-eight thousand, nine hundred eighty-three".