661141051616 has 12 divisors (see below), whose sum is σ = 1301621445432. Its totient is φ = 330570525792.

The previous prime is 661141051603. The next prime is 661141051661. The reversal of 661141051616 is 616150141166.

It is a happy number.

It is a super-2 number, since 2×661141051616² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661141051616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10330328900 + ... + 10330328963.

It is an arithmetic number, because the mean of its divisors is an integer number (108468453786).

Almost surely, 2^661141051616 is an apocalyptic number.

It is an amenable number.

661141051616 is a deficient number, since it is larger than the sum of its proper divisors (640480393816).

661141051616 is a wasteful number, since it uses less digits than its factorization.

661141051616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20660657873 (or 20660657865 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 661141051616 in words is "six hundred sixty-one billion, one hundred forty-one million, fifty-one thousand, six hundred sixteen".