1266638742 has 32 divisors (see below), whose sum is σ = 2911816800. Its totient is φ = 407653344.

The previous prime is 1266638741. The next prime is 1266638753. The reversal of 1266638742 is 2478366621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266638741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402853 + ... + 405984.

It is an arithmetic number, because the mean of its divisors is an integer number (90994275).

Almost surely, 2^1266638742 is an apocalyptic number.

1266638742 is an abundant number, since it is smaller than the sum of its proper divisors (1645178058).

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

1266638742 is a wasteful number, since it uses less digits than its factorization.

1266638742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808877 (or 808871 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 1266638742 is about 35589.8685302433. The cubic root of 1266638742 is about 1081.9759044020.

The spelling of 1266638742 in words is "one billion, two hundred sixty-six million, six hundred thirty-eight thousand, seven hundred forty-two".