55677667661 has 16 divisors (see below), whose sum is σ = 69428681088. Its totient is φ = 43377465600.

The previous prime is 55677667649. The next prime is 55677667723. The reversal of 55677667661 is 16676677655.

It is a de Polignac number, because none of the positive numbers 2^k-55677667661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55677667594 and 55677667603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55677667561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391361 + ... + 514313.

It is an arithmetic number, because the mean of its divisors is an integer number (4339292568).

Almost surely, 2^55677667661 is an apocalyptic number.

It is an amenable number.

55677667661 is a deficient number, since it is larger than the sum of its proper divisors (13751013427).

55677667661 is a wasteful number, since it uses less digits than its factorization.

55677667661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128852.

The product of its digits is 66679200, while the sum is 62.

The spelling of 55677667661 in words is "fifty-five billion, six hundred seventy-seven million, six hundred sixty-seven thousand, six hundred sixty-one".