661155241202606 has 32 divisors (see below), whose sum is σ = 1012421768904000. Its totient is φ = 323706272231680.

The previous prime is 661155241202581. The next prime is 661155241202641. The reversal of 661155241202606 is 606202142551166.

It is a super-2 number, since 2×661155241202606² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123129620 + ... + 128386968.

It is an arithmetic number, because the mean of its divisors is an integer number (31638180278250).

Almost surely, 2^{661155241202606} is an apocalyptic number.

661155241202606 is a deficient number, since it is larger than the sum of its proper divisors (351266527701394).

661155241202606 is a wasteful number, since it uses less digits than its factorization.

661155241202606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5259724.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 661155241202606 in words is "six hundred sixty-one trillion, one hundred fifty-five billion, two hundred forty-one million, two hundred two thousand, six hundred six".