55020651661 has 32 divisors (see below), whose sum is σ = 59415810048. Its totient is φ = 50859601920.

The previous prime is 55020651601. The next prime is 55020651671. The reversal of 55020651661 is 16615602055.

It is not a de Polignac number, because 55020651661 - 2³⁵ = 20660913293 is a prime.

It is a super-2 number, since 2×55020651661² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55020651661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55020651601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10314351 + ... + 10319683.

It is an arithmetic number, because the mean of its divisors is an integer number (1856744064).

Almost surely, 2^55020651661 is an apocalyptic number.

It is an amenable number.

55020651661 is a deficient number, since it is larger than the sum of its proper divisors (4395158387).

55020651661 is a wasteful number, since it uses less digits than its factorization.

55020651661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5581.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 55020651661 in words is "fifty-five billion, twenty million, six hundred fifty-one thousand, six hundred sixty-one".