1261545466 has 8 divisors (see below), whose sum is σ = 1918970784. Its totient is φ = 621888540.

The previous prime is 1261545433. The next prime is 1261545497. The reversal of 1261545466 is 6645451621.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4441920 + ... + 4442203.

It is an arithmetic number, because the mean of its divisors is an integer number (239871348).

Almost surely, 2^1261545466 is an apocalyptic number.

1261545466 is a deficient number, since it is larger than the sum of its proper divisors (657425318).

1261545466 is an equidigital number, since it uses as much as digits as its factorization.

1261545466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8884196.

The product of its digits is 172800, while the sum is 40.

The square root of 1261545466 is about 35518.2413134434. The cubic root of 1261545466 is about 1080.5237131926.

It can be divided in two parts, 12615 and 45466, that added together give a square (58081 = 241²).

The spelling of 1261545466 in words is "one billion, two hundred sixty-one million, five hundred forty-five thousand, four hundred sixty-six".