611115501661 has 16 divisors (see below), whose sum is σ = 699706805760. Its totient is φ = 522847140480.

The previous prime is 611115501637. The next prime is 611115501709. The reversal of 611115501661 is 166105511116.

It is not a de Polignac number, because 611115501661 - 2¹¹ = 611115499613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611115501361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11534371 + ... + 11587231.

It is an arithmetic number, because the mean of its divisors is an integer number (43731675360).

Almost surely, 2^611115501661 is an apocalyptic number.

It is an amenable number.

611115501661 is a deficient number, since it is larger than the sum of its proper divisors (88591304099).

611115501661 is a wasteful number, since it uses less digits than its factorization.

611115501661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55884.

The product of its (nonzero) digits is 5400, while the sum is 34.

The spelling of 611115501661 in words is "six hundred eleven billion, one hundred fifteen million, five hundred one thousand, six hundred sixty-one".