661266451306 has 8 divisors (see below), whose sum is σ = 992169445860. Its totient is φ = 330543302688.

The previous prime is 661266451301. The next prime is 661266451331. The reversal of 661266451306 is 603154662166.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 657382045681 + 3884405625 = 810791^2 + 62325^2 .

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

It is not an unprimeable number, because it can be changed into a prime (661266451301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44952291 + ... + 44966998.

Almost surely, 2^661266451306 is an apocalyptic number.

661266451306 is a deficient number, since it is larger than the sum of its proper divisors (330902994554).

661266451306 is a wasteful number, since it uses less digits than its factorization.

661266451306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89922968.

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 661266451306 in words is "six hundred sixty-one billion, two hundred sixty-six million, four hundred fifty-one thousand, three hundred six".