1266009891938 has 16 divisors (see below), whose sum is σ = 2193514465824. Its totient is φ = 541608509760.

The previous prime is 1266009891931. The next prime is 1266009891941. The reversal of 1266009891938 is 8391989006621.

It is not an unprimeable number, because it can be changed into a prime (1266009891931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1692526220 + ... + 1692526967.

It is an arithmetic number, because the mean of its divisors is an integer number (137094654114).

Almost surely, 2^{1266009891938} is an apocalyptic number.

1266009891938 is a deficient number, since it is larger than the sum of its proper divisors (927504573886).

1266009891938 is a wasteful number, since it uses less digits than its factorization.

1266009891938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3385053217.

The product of its (nonzero) digits is 10077696, while the sum is 62.

The spelling of 1266009891938 in words is "one trillion, two hundred sixty-six billion, nine million, eight hundred ninety-one thousand, nine hundred thirty-eight".