1266140642 has 16 divisors (see below), whose sum is σ = 2057858880. Its totient is φ = 580785552.

The previous prime is 1266140641. The next prime is 1266140647. The reversal of 1266140642 is 2460416621.

It is a super-2 number, since 2×1266140642² = 3206224250648344328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1266140599 and 1266140608.

It is not an unprimeable number, because it can be changed into a prime (1266140641) 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, 145142 + ... + 153617.

It is an arithmetic number, because the mean of its divisors is an integer number (128616180).

Almost surely, 2^1266140642 is an apocalyptic number.

1266140642 is a deficient number, since it is larger than the sum of its proper divisors (791718238).

1266140642 is a wasteful number, since it uses less digits than its factorization.

1266140642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298937.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 1266140642 is about 35582.8700641193. The cubic root of 1266140642 is about 1081.8340584176.

The spelling of 1266140642 in words is "one billion, two hundred sixty-six million, one hundred forty thousand, six hundred forty-two".