661490183055 has 48 divisors (see below), whose sum is σ = 1146431058336. Its totient is φ = 325551582720.

The previous prime is 661490183041. The next prime is 661490183059. The reversal of 661490183055 is 550381094166.

661490183055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661490183055 - 2²⁰ = 661489134479 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661490182995 and 661490183013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661490183059) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8124729 + ... + 8205741.

It is an arithmetic number, because the mean of its divisors is an integer number (23883980382).

Almost surely, 2^661490183055 is an apocalyptic number.

661490183055 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

661490183055 is a deficient number, since it is larger than the sum of its proper divisors (484940875281).

661490183055 is a wasteful number, since it uses less digits than its factorization.

661490183055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84268 (or 84255 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 661490183055 in words is "six hundred sixty-one billion, four hundred ninety million, one hundred eighty-three thousand, fifty-five".