611440521655 has 16 divisors (see below), whose sum is σ = 751838320800. Its totient is φ = 477086077440.

The previous prime is 611440521641. The next prime is 611440521697. The reversal of 611440521655 is 556125044116.

It is not a de Polignac number, because 611440521655 - 2⁵ = 611440521623 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300856 + ... + 1146034.

It is an arithmetic number, because the mean of its divisors is an integer number (46989895050).

Almost surely, 2^611440521655 is an apocalyptic number.

611440521655 is a deficient number, since it is larger than the sum of its proper divisors (140397799145).

611440521655 is a wasteful number, since it uses less digits than its factorization.

611440521655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848754.

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 611440521655 in words is "six hundred eleven billion, four hundred forty million, five hundred twenty-one thousand, six hundred fifty-five".