1266643002 has 64 divisors (see below), whose sum is σ = 2656114560. Its totient is φ = 402361344.

The previous prime is 1266642991. The next prime is 1266643003. The reversal of 1266643002 is 2003466621.

It is not an unprimeable number, because it can be changed into a prime (1266643003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2052598 + ... + 2053214.

It is an arithmetic number, because the mean of its divisors is an integer number (41501790).

Almost surely, 2^1266643002 is an apocalyptic number.

1266643002 is an abundant number, since it is smaller than the sum of its proper divisors (1389471558).

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

1266643002 is a wasteful number, since it uses less digits than its factorization.

1266643002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 1266643002 is about 35589.9283786860. The cubic root of 1266643002 is about 1081.9771173793.

The spelling of 1266643002 in words is "one billion, two hundred sixty-six million, six hundred forty-three thousand, two".