1266401604 has 192 divisors, whose sum is σ = 3639202560. Its totient is φ = 338411520.

The previous prime is 1266401599. The next prime is 1266401611. The reversal of 1266401604 is 4061046621.

It is a super-2 number, since 2×1266401604² = 3207546045227545632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2065602 + ... + 2066214.

It is an arithmetic number, because the mean of its divisors is an integer number (18954180).

Almost surely, 2^1266401604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266401604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1819601280).

1266401604 is an abundant number, since it is smaller than the sum of its proper divisors (2372800956).

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

1266401604 is a wasteful number, since it uses less digits than its factorization.

1266401604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710 (or 708 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1266401604 is about 35586.5368362812. The cubic root of 1266401604 is about 1081.9083782776.

The spelling of 1266401604 in words is "one billion, two hundred sixty-six million, four hundred one thousand, six hundred four".