661149146011 has 16 divisors (see below), whose sum is σ = 675030021120. Its totient is φ = 647359970400.

The previous prime is 661149146003. The next prime is 661149146027. The reversal of 661149146011 is 110641941166.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 661149146011 - 2³ = 661149146003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661149146111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33717136 + ... + 33736738.

It is an arithmetic number, because the mean of its divisors is an integer number (42189376320).

Almost surely, 2^661149146011 is an apocalyptic number.

661149146011 is a deficient number, since it is larger than the sum of its proper divisors (13880875109).

661149146011 is a wasteful number, since it uses less digits than its factorization.

661149146011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21906.

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 661149146011 in words is "six hundred sixty-one billion, one hundred forty-nine million, one hundred forty-six thousand, eleven".