1266640415 has 8 divisors (see below), whose sum is σ = 1599966960. Its totient is φ = 959980032.

The previous prime is 1266640411. The next prime is 1266640421. The reversal of 1266640415 is 5140466621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1266640415 - 2² = 1266640411 is a prime.

It is a super-2 number, since 2×1266640415² = 3208755881822744450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266640411) 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, 6666434 + ... + 6666623.

It is an arithmetic number, because the mean of its divisors is an integer number (199995870).

Almost surely, 2^1266640415 is an apocalyptic number.

1266640415 is a deficient number, since it is larger than the sum of its proper divisors (333326545).

1266640415 is a wasteful number, since it uses less digits than its factorization.

1266640415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13333081.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1266640415 is about 35589.8920341155. The cubic root of 1266640415 is about 1081.9763807664.

The spelling of 1266640415 in words is "one billion, two hundred sixty-six million, six hundred forty thousand, four hundred fifteen".