1266041640 has 64 divisors (see below), whose sum is σ = 3827165760. Its totient is φ = 335029760.

The previous prime is 1266041639. The next prime is 1266041671. The reversal of 1266041640 is 461406621.

It is a super-2 number, since 2×1266041640² = 3205722868427779200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1266041598 and 1266041607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24549 + ... + 55988.

It is an arithmetic number, because the mean of its divisors is an integer number (59799465).

Almost surely, 2^1266041640 is an apocalyptic number.

1266041640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266041640 is an abundant number, since it is smaller than the sum of its proper divisors (2561124120).

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

1266041640 is a wasteful number, since it uses less digits than its factorization.

1266041640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80682 (or 80678 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1266041640 is about 35581.4788900068. The cubic root of 1266041640 is about 1081.8058607794.

The spelling of 1266041640 in words is "one billion, two hundred sixty-six million, forty-one thousand, six hundred forty".